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what muscle that pulls the hhumerus to the posterior

The Muscular System

Muscles of the Pectoral Girdle and Upper Limbs

OpenStaxCollege

Learning Objectives

By the end of this section, you will be able to:

  • Identify the muscles of the pectoral girdle and upper limbs
  • Identify the movement and function of the pectoral girdle and upper limbs

Muscles of the shoulder and upper limb can exist divided into four groups: muscles that stabilize and position the pectoral girdle, muscles that move the arm, muscles that motility the forearm, and muscles that motion the wrists, easily, and fingers. The pectoral girdle, or shoulder girdle, consists of the lateral ends of the clavicle and scapula, along with the proximal end of the humerus, and the muscles roofing these 3 bones to stabilize the shoulder joint. The girdle creates a base from which the head of the humerus, in its ball-and-socket joint with the glenoid fossa of the scapula, can motility the arm in multiple directions.

Muscles That Position the Pectoral Girdle

Muscles that position the pectoral girdle are located either on the anterior thorax or on the posterior thorax ([link] and [link]). The anterior muscles include the subclavius, pectoralis modest, and serratus inductive. The posterior muscles include the trapezius, rhomboid major, and rhomboid minor. When the rhomboids are contracted, your scapula moves medially, which tin can pull the shoulder and upper limb posteriorly.

Muscles That Position the Pectoral Girdle

The muscles that stabilize the pectoral girdle get in a steady base of operations on which other muscles tin can move the arm. Notation that the pectoralis major and deltoid, which move the humerus, are cut here to show the deeper positioning muscles.


The left panel shows the anterior lateral view of the pectoral girdle muscle, and the right panel shows the posterior view of the pectoral girdle muscle.

Muscles that Position the Pectoral Girdle
Position in the thorax Movement Target Target motion direction Prime mover Origin Insertion
Anterior thorax Stabilizes clavicle during movement past depressing it Clavicle Depression Subclavius First rib Inferior surface of clavicle
Anterior thorax Rotates shoulder anteriorly (throwing motion); assists with inhalation Scapula; ribs Scapula: depresses; ribs: elevates Pectoralis small Anterior surfaces of certain ribs (2–4 or three–5) Coracoid process of scapula
Anterior thorax Moves arm from side of body to forepart of body; assists with inhalation Scapula; ribs Scapula: protracts; ribs: elevates Serratus inductive Muscle slips from certain ribs (1–8 or ane–9) Inductive surface of vertebral border of scapula
Posterior thorax Elevates shoulders (shrugging); pulls shoulder blades together; tilts head backwards Scapula; cervical spine Scapula: rotests inferiorly, retracts, elevates, and depresses; spine: extends Trapezius Skull; vertebral column Acromion and spine of scapula; clavicle
Posterior thorax Stabilizes scapula during pectoral girdle movement Scapula Retracts; rotates inferiorly Rhomboid major Thoracic vertebrae (T2–T5) Medial border of scapula
Posterior thorax Stabilizes scapula during pectoral girdle movement Scapula Retracts; rotates inferiorly Rhomboid minor Cervical and thoracic vertebrae (C7 and T1) Medial border of scapula

Muscles That Move the Humerus

Similar to the muscles that position the pectoral girdle, muscles that cantankerous the shoulder joint and move the humerus os of the arm include both centric and scapular muscles ([link] and [link]). The two axial muscles are the pectoralis major and the latissimus dorsi. The pectoralis major is thick and fan-shaped, covering much of the superior portion of the anterior thorax. The broad, triangular latissimus dorsi is located on the inferior function of the dorsum, where it inserts into a thick connective tissue shealth called an aponeurosis.

Muscles That Move the Humerus

(a, c) The muscles that motion the humerus anteriorly are by and large located on the anterior side of the body and originate from the sternum (east.g., pectoralis major) or the anterior side of the scapula (east.g., subscapularis). (b) The muscles that move the humerus superiorly generally originate from the superior surfaces of the scapula and/or the clavicle (eastward.thousand., deltoids). The muscles that move the humerus inferiorly generally originate from eye or lower back (e.1000., latissiumus dorsi). (d) The muscles that move the humerus posteriorly are mostly located on the posterior side of the trunk and insert into the scapula (east.g., infraspinatus).


The top left panel shows the lateral view of the pectoral and back muscles. The top right panel shows the posterior view of the right deltoid and the left back muscle. The bottom left panel shows the anterior view of the deep muscles of the left shoulder, and the bottom right panel shows the deep muscles of the left shoulder.

Muscles That Move the Humerus


This table describes the muscles that move the humerus. The pectoralis major is an axial muscle that brings the elbows together and moves the elbows up (as during an uppercut punch). It originates in the clavicle, sternum, cartilage of ribs 1 through 6 or 1 through 7, and the aponeurosis of the external oblique muscle. The latissimus dorsi is an axial muscle that moves the elbow back (as in elbowing someone standing behind you) or spreads the elbows apart. It originates in the thoracic vertebrae (T7 through T12), the lower vertebrae, ribs 9 through 12, and the iliac crest. The deltoid is a scapular muscle that lifts arms at the shoulder. It originates in the trapezius, clavicle, acromion, and spine of scapula. The subscapularis is a scapular muscle that assists the pectoralis major in bringing the elbows together and stabilizes the shoulder joint during movement of the pectoral girdle. It originates in the subscapular fossa of the scapula. The supraspinatus is a scapular muscle that rotates the elbow outwards, as during a tennis swing. It originates in the supraspinous fossa of the scapula. The infraspinatus is a scapular muscle that rotates the elbow outwards, as during a tennis swing. It originates in the infraspinous fossa of the scapula. The teres major is a scapular muscle that assists the infraspinatus in rotating the elbow outwards. It originates in the posterior surface of the scapula. The teres minor is a scapular muscle that assists the infraspinatus in rotating the elbow outwards. It originates in the lateral border of the dorsal scapular surface. The coracobra chialis is a scapular muscle that moves the elbow up and across the body, as when putting a hand on the chest. It originates in the coracoid process of the scapula.

The rest of the shoulder muscles originate on the scapula. The anatomical and ligamental construction of the shoulder joint and the arrangements of the muscles covering it, allows the arm to carry out different types of movements. The deltoid, the thick muscle that creates the rounded lines of the shoulder is the major abductor of the arm, but information technology also facilitates flexing and medial rotation, also as extension and lateral rotation. The subscapularis originates on the anterior scapula and medially rotates the arm. Named for their locations, the supraspinatus (superior to the spine of the scapula) and the infraspinatus (inferior to the spine of the scapula) abduct the arm, and laterally rotate the arm, respectively. The thick and flat teres major is junior to the teres minor and extends the arm, and assists in adduction and medial rotation of it. The long teres pocket-size laterally rotates and extends the arm. Finally, the coracobrachialis flexes and adducts the arm.

The tendons of the deep subscapularis, supraspinatus, infraspinatus, and teres pocket-size connect the scapula to the humerus, forming the rotator cuff (musculotendinous gage), the circle of tendons around the shoulder joint. When baseball pitchers undergo shoulder surgery information technology is usually on the rotator gage, which becomes pinched and inflamed, and may tear away from the bone due to the repetitive motion of bring the arm overhead to throw a fast pitch.

Muscles That Motility the Forearm

The forearm, made of the radius and ulna bones, has four main types of action at the hinge of the elbow articulation: flexion, extension, pronation, and supination. The forearm flexors include the biceps brachii, brachialis, and brachioradialis. The extensors are the triceps brachii and anconeus. The pronators are the pronator teres and the pronator quadratus, and the supinator is the simply i that turns the forearm anteriorly. When the forearm faces anteriorly, it is supinated. When the forearm faces posteriorly, it is pronated.

The biceps brachii, brachialis, and brachioradialis flex the forearm. The two-headed biceps brachii crosses the shoulder and elbow joints to flex the forearm, also taking role in supinating the forearm at the radioulnar joints and flexing the arm at the shoulder joint. Deep to the biceps brachii, the brachialis provides additional power in flexing the forearm. Finally, the brachioradialis can flex the forearm quickly or help lift a load slowly. These muscles and their associated blood vessels and nerves form the anterior compartment of the arm (anterior flexor compartment of the arm) ([link] and [link]).

Muscles That Move the Forearm

The muscles originating in the upper arm flex, extend, pronate, and supinate the forearm. The muscles originating in the forearm move the wrists, easily, and fingers.


This multipart figure shows the different muscles that move the forearm. The major muscle groups are labeled.

Muscles That Motility the Forearm


This table describes the muscles that move the forearm. The biceps brachii are anterior muscles that perform a bicep curl; they also allow the palm of the hand to point toward the body while flexing. They originate in the coracoid process and the tubercle above the glenoid cavity. The brachialis originates in the front of the distal humerus. The brachioradialis is an anterior muscle that assists and stablizes the elbow during bicep-curl motion. It originates in the lateral supracondylar ridge at the distal end of the humerus. The triceps brachii are posterior muscles that extend the forearm, as during a punch. They originate in the infraglenoid tubercle of the scapula, the posterior shaft of the humerus, and the posterior humeral shaft distal to the radial groove. The aconeus is a posterior muscle that assists in extending the forearm; it also allows the forearm to extend away from the body. It originates in the lateral epicondyle of the humerus. The pronator teres is an anterior muscle that turns the hand palm-down. It originates in the medial epicondyle of the humerus and the coronoid process of the ulna. The pronator quadratus is an anterior muscle that assists in turning the hand palm-down. It originates in the distal portion of the anterior ulnar shaft. The supinator is a posterior muscle that turns the hand palm-down. It originates in the lateral epicondyle of the humerus and the proximal ulna.

Muscles That Movement the Wrist, Hand, and Fingers

Wrist, hand, and finger movements are facilitated by two groups of muscles. The forearm is the origin of the extrinsic muscles of the hand. The palm is the origin of the intrinsic muscles of the hand.

Muscles of the Arm That Move the Wrists, Hands, and Fingers

The muscles in the anterior compartment of the forearm (inductive flexor compartment of the forearm) originate on the humerus and insert onto unlike parts of the mitt. These brand upwardly the bulk of the forearm. From lateral to medial, the superficial anterior compartment of the forearm includes the flexor carpi radialis, palmaris longus, flexor carpi ulnaris, and flexor digitorum superficialis. The flexor digitorum superficialis flexes the hand also as the digits at the duke, which allows for rapid finger movements, as in typing or playing a musical instrument (see [link] and [link]). However, poor ergonomics can irritate the tendons of these muscles as they slide back and along with the carpal tunnel of the inductive wrist and pinch the median nerve, which also travels through the tunnel, causing Carpal Tunnel Syndrome. The deep inductive compartment produces flexion and bends fingers to make a fist. These are the flexor pollicis longus and the flexor digitorum profundus.

The muscles in the superficial posterior compartment of the forearm (superficial posterior extensor compartment of the forearm) originate on the humerus. These are the extensor radialis longus, extensor carpi radialis brevis, extensor digitorum, extensor digiti minimi, and the extensor carpi ulnaris.

The muscles of the deep posterior compartment of the forearm (deep posterior extensor compartment of the forearm) originate on the radius and ulna. These include the abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus, and extensor indicis (see [link]).

Muscles That Move the Wrist, Easily, and Forearm


This table describes the muscles that move the wrist, hands, and forearm. These muscles make up the superficial anterior compartment of the forearm. The flexor carpi radialis bends the wrist toward the body; it also tilts the hand to the side away from the body. It originates in the medial epicondyle of the humerus. The palmaris longus assists in bending the hand up toward the shoulder. It originates in the medial epicondyle of the humerus. The flexor carpi ulnaris assists in bending the hand up toward the shoulder; it also tilts the hand to the side away from the body and stabilizes the wrist. It originates in the medial epicondyle of the humerus, the olecranon process, and the posterior surface of the ulna. The flexor digitorum superficialis bends the fingers to make a fist. It originates in the medial epicondyle of the humerus, the coronoid process of the ulna, and the shaft of the radius. These muscles make up the deep anterior compartment of the forearm. The flexor pollicis longus bends the tip of the thumb. It originates in the anterior surface of the radius and the interosseous membrane. The flexor digitorum profundus bends the fingers to make a fist; it also bends the wrist toward the body. It originates in the coronoid process, the anteromedial surface of the ulna, and the interosseous membrane. These muscles make up the superficial posterior compartment of the forearm. The extensor radialis longus straightens the wrist away from the body; it also tilts the hand to the side away from the body. It originates in the lateral supracondylar ridge of the humerus. The extensor carpi radialis brevis assists the extensor radialis longus in extending and abducting the wrist; it also stabilizes the hand during finger flexion. It originates in the lateral epicondyle of the humerus. The extensor digitorum opens the fingers and moves them sideways away from the body. It originates in the lateral epicondyle of the humerus. The extensor digiti minimi extends the little finger. It originates in the lateral epicondyle of the humerus. The extensor carpi ulnaris straightens the wrist away from the body; it also tilts the hand to the side toward the body. It originates in the lateral epicondyle of the humerus and the posterior of the ulna. These muscles make up the deep posterior compartment of the forearm. The abductor pollicis longus moves the thumb sideways toward the body; it also extends the thumb and moves the hand sideways toward the body. It originates in the posterior surface of the radius and ulna and in the interosseous membrane. The extensor pollicis brevis extends the thumb. It originates in the dorsal shaft of the radius and ulna and in the interosseous membrane. The extensor pollicis longus extends the thumb. It originates in the dorsal shaft of the radius and ulna and in the interosseous membrane. The extensor indicis extends the index finger; it also straightens the wrist away from the body. It originates in the posterior surface of the distal ulna and in the interosseous membrane.

The tendons of the forearm muscles attach to the wrist and extend into the hand. Fibrous bands called retinacula sheath the tendons at the wrist. The flexor retinaculum extends over the palmar surface of the hand while the extensor retinaculum extends over the dorsal surface of the hand.

Intrinsic Muscles of the Hand

The intrinsic muscles of the hand both originate and insert within it ([link]). These muscles allow your fingers to also make precise movements for deportment, such every bit typing or writing. These muscles are divided into 3 groups. The thenar muscles are on the radial aspect of the palm. The hypothenar muscles are on the medial aspect of the palm, and the intermediate muscles are midpalmar.

The thenar muscles include the abductor pollicis brevis, opponens pollicis, flexor pollicis brevis, and the adductor pollicis. These muscles form the thenar eminence, the rounded contour of the base of the thumb, and all deed on the thumb. The movements of the thumb play an integral role in nigh precise movements of the hand.

The hypothenar muscles include the abductor digiti minimi, flexor digiti minimi brevis, and the opponens digiti minimi. These muscles form the hypothenar eminence, the rounded profile of the picayune finger, and as such, they all act on the little finger. Finally, the intermediate muscles act on all the fingers and include the lumbrical, the palmar interossei, and the dorsal interossei.

Intrinsic Muscles of the Mitt

The intrinsic muscles of the hand both originate and insert within the hand. These muscles provide the fine motor control of the fingers by flexing, extending, abducting, and adducting the more than distal finger and thumb segments.


This multipart figure shows the intrinsic muscles of the hand with the major muscle groups labeled.

Intrinsic Muscles of the Hand
Musculus Movement Target Target motility direction Prime number mover Origin Insertion
Thenar muscles Moves thumb toward trunk Thumb Abduction Abductor pollicis brevis Flexor retinaculum; and nearby carpals Lateral base of operations of proximal phalanx of pollex
Thenar muscles Moves thumb across palm to touch other fingers Thumb Opposition Opponens pollicis Flexor retinaculum; trapezium Inductive of first metacarpal
Thenar muscles Flexes thumb Thumb Flexion Flexor pollicis brevis Flexor retinaculum; trapezium Lateral base of proximal phalanx of thumb
Thenar muscles Moves thumb away from trunk Pollex Adduction Adductor pollicis Capitate bone; bases of metacarpals 2–four; front of metacarpal 3 Medial base of proximal phalanx of thumb
Hypothenar muscles Moves pinkie toward torso Pinkie Abduction Abductor digiti minimi Pisiform bone Medial side of proximal phalanx of little finger
Hypothenar muscles Flexes little finger Fiddling finger Flexion Flexor digiti minimi brevis Hamate os; flexor retinaculum Medial side of proximal phalanx of little finger
Hypothenar muscles Moves pinkie across palm to touch pollex Trivial finger Opposition Opponens digiti minimi Hamate bone; flexor retinaculum Medial side of 5th metacarpal
Intermediate muscles Flexes each finger at metacarpo-phalangeal joints; extends each finger at interphalangeal joints Fingers Flexion Lumbricals Palm (lateral sides of tendons in flexor digitorum profundus) Fingers 2–5 (lateral edges of extensional expansions on get-go phalanges)
Intermediate muscles Adducts and flexes each finger at metacarpo-phalangeal joints; extends each finger at interphalangeal joints Fingers Adduction; flexion; extension Palmar interossei Side of each metacarpal that faces metacarpal iii (absent from metacarpal 3) Extensor expansion on first phalanx of each finger (except finger 3) on side facing finger iii
Intermediate muscles Abducts and flexes the three middle fingers at metacarpo-phalangeal joints; extends the three middle fingers at interphalangeal joints Fingers Abduction; flexion; extension Dorsal interossei Sides of metacarpals Both sides of finger 3; for each other finger, extensor expansion over starting time phalanx on side opposite finger 3

Chapter Review

The clavicle and scapula make upwardly the pectoral girdle, which provides a stable origin for the muscles that move the humerus. The muscles that position and stabilize the pectoral girdle are located on the thorax. The inductive thoracic muscles are the subclavius, pectoralis minor, and the serratus inductive. The posterior thoracic muscles are the trapezius, levator scapulae, rhomboid major, and rhomboid minor. Ix muscles cantankerous the shoulder joint to motion the humerus. The ones that originate on the axial skeleton are the pectoralis major and the latissimus dorsi. The deltoid, subscapularis, supraspinatus, infraspinatus, teres major, teres pocket-sized, and coracobrachialis originate on the scapula.

The forearm flexors include the biceps brachii, brachialis, and brachioradialis. The extensors are the triceps brachii and anconeus. The pronators are the pronator teres and the pronator quadratus. The supinator is the only i that turns the forearm anteriorly.

The extrinsic muscles of the hands originate forth the forearm and insert into the hand in order to facilitate crude movements of the wrists, hands, and fingers. The superficial anterior compartment of the forearm produces flexion. These muscles are the flexor carpi radialis, palmaris longus, flexor carpi ulnaris, and the flexor digitorum superficialis. The deep inductive compartment produces flexion as well. These are the flexor pollicis longus and the flexor digitorum profundus. The remainder of the compartments produce extension. The extensor carpi radialis longus, extensor carpi radialis brevis, extensor digitorum, extensor digiti minimi, and extensor carpi ulnaris are the muscles found in the superficial posterior compartment. The deep posterior compartment includes the abductor longus, extensor pollicis brevis, extensor pollicis longus, and the extensor indicis.

Finally, the intrinsic muscles of the hands allow our fingers to make precise movements, such as typing and writing. They both originate and insert within the hand. The thenar muscles, which are located on the lateral part of the palm, are the abductor pollicis brevis, opponens pollicis, flexor pollicis brevis, and adductor pollicis. The hypothenar muscles, which are located on the medial part of the palm, are the abductor digiti minimi, flexor digiti minimi brevis, and opponens digiti minimi. The intermediate muscles, located in the middle of the palm, are the lumbricals, palmar interossei, and dorsal interossei.

Review Questions

The rhomboid major and minor muscles are deep to the ________.

  1. rectus abdominis
  2. scalene muscles
  3. trapezius
  4. ligamentum nuchae

C

Which muscle extends the forearm?

  1. biceps brachii
  2. triceps brachii
  3. brachialis
  4. deltoid

B

What is the origin of the wrist flexors?

  1. the lateral epicondyle of the humerus
  2. the medial epicondyle of the humerus
  3. the carpal bones of the wrist
  4. the deltoid tuberosity of the humerus

B

Which muscles stabilize the pectoral girdle?

  1. centric and scapular
  2. centric
  3. appendicular
  4. axial and appendicular

A

Critical Thinking Questions

The tendons of which muscles form the rotator cuff? Why is the rotator cuff important?

Tendons of the infraspinatus, supraspinatus, teres minor, and the subscapularis form the rotator gage, which forms a foundation on which the arms and shoulders can be stabilized and move.

List the full general musculus groups of the shoulders and upper limbs too equally their subgroups.

The muscles that make up the shoulders and upper limbs include the muscles that position the pelvic girdle, the muscles that movement the humerus, the muscles that move the forearm, and the muscles that movement the wrists, hands, and fingers.

Glossary

abductor digiti minimi
muscle that abducts the little finger
adductor pollicis
muscle that adducts the thumb
abductor pollicis brevis
muscle that abducts the pollex
abductor pollicis longus
muscle that inserts into the starting time metacarpal
anconeus
small muscle on the lateral posterior elbow that extends the forearm
anterior compartment of the arm
(anterior flexor compartment of the arm) the biceps brachii, brachialis, brachioradialis, and their associated blood vessels and nerves
inductive compartment of the forearm
(anterior flexor compartment of the forearm) deep and superficial muscles that originate on the humerus and insert into the paw
biceps brachii
two-headed musculus that crosses the shoulder and elbow joints to flex the forearm while assisting in supinating it and flexing the arm at the shoulder
brachialis
muscle deep to the biceps brachii that provides power in flexing the forearm.
brachioradialis
muscle that tin flex the forearm quickly or help lift a load slowly
coracobrachialis
muscle that flexes and adducts the arm
deep inductive compartment
flexor pollicis longus, flexor digitorum profundus, and their associated blood vessels and nerves
deep posterior compartment of the forearm
(deep posterior extensor compartment of the forearm) the abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus, extensor indicis, and their associated blood vessels and nerves
deltoid
shoulder muscle that abducts the arm as well as flexes and medially rotates it, and extends and laterally rotates it
dorsal interossei
muscles that abduct and flex the three heart fingers at the metacarpophalangeal joints and extend them at the interphalangeal joints
extensor carpi radialis brevis
muscle that extends and abducts the hand at the wrist
extensor carpi ulnaris
muscle that extends and adducts the hand
extensor digiti minimi
musculus that extends the little finger
extensor digitorum
muscle that extends the manus at the wrist and the phalanges
extensor indicis
muscle that inserts onto the tendon of the extensor digitorum of the index finger
extensor pollicis brevis
muscle that inserts onto the base of the proximal phalanx of the thumb
extensor pollicis longus
muscle that inserts onto the base of the distal phalanx of the thumb
extensor radialis longus
muscle that extends and abducts the mitt at the wrist
extensor retinaculum
band of connective tissue that extends over the dorsal surface of the hand
extrinsic muscles of the hand
muscles that movement the wrists, hands, and fingers and originate on the arm
flexor carpi radialis
musculus that flexes and abducts the paw at the wrist
flexor carpi ulnaris
muscle that flexes and adducts the manus at the wrist
flexor digiti minimi brevis
muscle that flexes the little finger
flexor digitorum profundus
musculus that flexes the phalanges of the fingers and the hand at the wrist
flexor digitorum superficialis
muscle that flexes the hand and the digits
flexor pollicis brevis
muscle that flexes the thumb
flexor pollicis longus
muscle that flexes the distal phalanx of the thumb
flexor retinaculum
band of connective tissue that extends over the palmar surface of the manus
hypothenar
grouping of muscles on the medial attribute of the palm
hypothenar eminence
rounded profile of muscle at the base of operations of the little finger
infraspinatus
muscle that laterally rotates the arm
intermediate
grouping of midpalmar muscles
intrinsic muscles of the hand
muscles that motion the wrists, hands, and fingers and originate in the palm
latissimus dorsi
broad, triangular axial muscle located on the inferior part of the back
lumbrical
muscle that flexes each finger at the metacarpophalangeal joints and extend each finger at the interphalangeal joints
opponens digiti minimi
muscle that brings the pinkie across the palm to encounter the thumb
opponens pollicis
muscle that moves the pollex across the palm to meet some other finger
palmar interossei
muscles that housebreak and flex each finger at the metacarpophalangeal joints and extend each finger at the interphalangeal joints
palmaris longus
muscle that provides weak flexion of the paw at the wrist
pectoral girdle
shoulder girdle, made up of the clavicle and scapula
pectoralis major
thick, fan-shaped axial musculus that covers much of the superior thorax
pectoralis small
muscle that moves the scapula and assists in inhalation
pronator quadratus
pronator that originates on the ulna and inserts on the radius
pronator teres
pronator that originates on the humerus and inserts on the radius
retinacula
gristly bands that sheath the tendons at the wrist
rhomboid major
muscle that attaches the vertebral border of the scapula to the spinous process of the thoracic vertebrae
rhomboid minor
muscle that attaches the vertebral border of the scapula to the spinous process of the thoracic vertebrae
rotator cuff
(too, musculotendinous cuff) the circle of tendons effectually the shoulder joint
serratus inductive
large and flat muscle that originates on the ribs and inserts onto the scapula
subclavius
musculus that stabilizes the clavicle during movement
subscapularis
muscle that originates on the inductive scapula and medially rotates the arm
superficial anterior compartment of the forearm
flexor carpi radialis, palmaris longus, flexor carpi ulnaris, flexor digitorum superficialis, and their associated claret vessels and nerves
superficial posterior compartment of the forearm
extensor radialis longus, extensor carpi radialis brevis, extensor digitorum, extensor digiti minimi, extensor carpi ulnaris, and their associated claret vessels and fretfulness
supinator
muscle that moves the palm and forearm anteriorly
supraspinatus
muscle that abducts the arm
teres major
muscle that extends the arm and assists in adduction and medial rotation of information technology
teres minor
muscle that laterally rotates and extends the arm
thenar
group of muscles on the lateral attribute of the palm
thenar eminence
rounded contour of muscle at the base of operations of the thumb
trapezius
muscle that stabilizes the upper part of the back
triceps brachii
three-headed muscle that extends the forearm

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Source: https://pressbooks-dev.oer.hawaii.edu/anatomyandphysiology/chapter/muscles-of-the-pectoral-girdle-and-upper-limbs/