Snell's Anatomy MOINA - UE Compiled

Pectoralis Major

O: Clavicle, sternum, and upper six costal cartilages

I: Lateral lip of bicipital groove of humerus

N: Medial and lateral pectoral nerves from brachial plexus

A: Adducts arm Medial rotation of humerus; clavicular fibers also flex arm

Pectoralis minor

O: 3rd, 4th, and 5th ribs

I: Coracoid process of scapula

N: Medial pectoral nerve from brachial plexus

A: Depresses point of shoulder; if the scapula is fixed, elevates ribs of origin

Subclavius

O: 1st costal cartilage

I: Clavicle

N: Nerve to subclavius from upper trunk of brachial plexus

A: Depresses the clavicle and steadies the bone during shoulder girdle movements

Serratus Anterior

O: Upper eight ribs

I: Medial border and inferior angle of scapula

N: Long thoracic nerve

A: Draws the scapula forward around the thoracic wall; rotates the scapula

Trapezius

O: Occipital bone, ligamentum nuchae, spine of C7-T12

I: Lateral third of clavicle, acromion, and spine of scapula

N: Spinal part of the accessory nerve (cranial nerve XI) and C3, C4

A: Upper fibers elevate scapula; middle fibers retract scapula; lower fibers rotate scapula

Latissimus Dorsi

O: Iliac crest, lumbar fascia, spines of lower six thoracic vertebrae, lower three or four ribs, inferior angle of scapula

I: Floor of bicipital groove of humerus

N: Thoracodorsal nerve

A: Extends, adducts, and medially rotates the arm

Levator Scapulae

O: Transverse processes of 1st four cervical vertebrae

I: Medial border of scapula

N: C3 and 4 and dorsal scapular nerve

A: Raises medial border of

scapula

Rhomboid Minor

O: Ligamentum nuchae and spines of 7th cervical and 1st thoracic vertebrae

I: Medial border of scapula

N: Dorsal scapular nerve

A: Raises medial border of scapula upward and medially

Rhomboid Major

O: 2nd - 5th Thoracic spines

I: Medial Border of Scapula

N: Dorsal Scapular Nerve

A: Raises Medial border of scapula upward and medially

Deltoid

O: Lateral third of clavicle, acromion, spine of scapula

I: Deltoid tuberosity of humerus

N: Axillary nerve

A: Abducts arm; anterior fibers flex and medially rotate arm; posterior fibers extend and laterally rotate arm

Supraspinatus

O: Supraspinous fossa of scapula

I: Greater tuberosity of humerus; capsule of shoulder joint

N: Suprascapular nerve

A: Abducts arm and stabilizes shoulder joint

Infraspinatus

O: Infraspinous fossa of scapula

I: Greater tuberosity of humerus; capsule of shoulder joint

N: Suprascapular nerve

A: Laterally rotates arm and stabilizes shoulder joint

Subscapularis

O: Subscapular fossa of scapula

I: Lesser tuberosity of humerus

N: Upper and lower subscapular nerves

A: Medially rotates arm and stabilizes shoulder joint

Teres Major

O: Lower third of lateral border of scapula

I: Medial lip of bicipital groove

of humerus

N: Lower subscapular

nerve

A: Medially rotates and adducts

arm and stabilizes shoulder

joint

Teres Minor

O: Upper two-thirds of lateral border of scapula

I: Greater tuberosity of humerus; capsule of shoulder joint

N: Axillary Nerve

A: Laterally rotates arm and

stabilizes shoulder joint

Biceps Brachii

O: Long Head - Supraglenoid Tubercle of scapula; Short Head - Coracoid process of scapula

I: Radial Tuberosity

N: Musculocutaneous Nerve

A: FA Supination, Elbow Flexor, Weak SH joint flexor

Coracobrachialis

O: Coracoid process of scapula

I: Medial aspect of shaft of humerus

N: Musculocutaneous Nerve

A: Arm Flexion, Weak Adductor

Brachialis

O: Front of lower half of humerus

I: Coronoid process of ulna

N: Musculocutaneous nerve

A: Elbow Flex.

Triceps

O:

Long Head - Infraglenoid Tubercle of Scapula

Lateral Head - Upper half of posterior surface of shaft of humerus

Medial Head - Lower half of posterior surface of shaft of humerus

I: Olecranon process of Ulna

N: Radial nerve

A: Elbow Extension

Pronator Teres

O: Humeral Head - Medial Epicondyle of humerus ; Ulnar Head - Medial border of coronoid process of ulna

I: Lateral aspect of shaft of radius

N: Median Nerve

A: FA pronation and flexion

Flexor Carpi Radialis

O: Medial Epicondyle of humerus

I: Bases of 2nd and 3rd MCP

N: Median Nerve

A: Wrist Flex. and Abd.

Palmaris Longus

O: Medial Epicondyle of Humerus

I: Flexor retinuaculum and palmar aponeurosis

N: Median Nerve

A: Flexes Hand

Flexor Carpi Ulnaris

O: Humeral head - Medial Epicondyle of Humerus; Ulnar head - Medial aspect of olecranon process and posterior border of ulna

I: Pisiform bone, hook of the hamate, base at

5th MCP

N: Ulnar Nerve

A: Wrist Flex. and Add.

Flexor Digitorum Superficialis

O: Humeroulnar Head - Medial epicondyle of humerus; medial border of coronoid process of ulna; Radial Head - Oblique line on anterior surface of shaft of radius

I: Middle Phalanx of Medial 4 Fingers

N: Median Nerve

A: Flexion of Middle Phalanx, Assist in flexing proximal phalanx of hand

Flexor Pollicis Longus

O: Anterior surface of shaft of radius

I: Distal phalanx of thumb

N: Anterior interosseus branch of median nerve

A: Flexes distal phalanx of thumb

Flexor Digitorum Profondus

O: Anteromedial surface of shaft of ulna

I: Distal Phalanges of medial 4 fingers

N: Ulnar (medial half) and median (lateral half) nerves

A: Flexes distal phalanx of fingers; then assists in flexion of middle and proximal phalanges and wrist

Pronator Quadratus

O: Anterior surface of shaft of ulna

I: Anterior surface of Shaft of radius

N: Anterior interosseus branch of median nerve

A: Pronates forearm

Brachioradialis

O: Lateral supracondylar ridge of humerus

I: Base of styloid process of radius

N: Radial Nerve

A: Elbow Flex., Rotates FA to the midprone position

Extensor Carpi Radialis Longus

O: Lateral supracondylar ridge of humerus

I: Posterior surface of base of second metacarpal

bone

N: Radial nerve

A: Wrist Extension and Abd.

Extensor Carpi Radialis Brevis

O: Lateral Epicondyle of humerus

I: Posterior surface of base of 3rd MCP

N: Deep branch of radial nerve

A: Wrist Ext., and Abd.

Extensor Digitorum

O: Lateral epicondyle of humerus

I: Middle and Distal phalanges of medial 4 fingers

N: Deep branch of Radial Nerve

A: Extends fingers and hand

Extensor Digiti Minimi

O: Lateral epicondyle of humerus

I: Extensor expansion of little finger

N: Deep branch of Radial Nerve

A: Extends MCP of little finger

Extensor carpi ulnaris

O: Lateral Epicondyle of humerus

I: Base of 5th MCP

N: Deep branch of radial nerve

A: Wrist Ext., and Add.

Anconeus

O: Lateral Epicondyle of humerus

I: Lateral surface of olecranon process of ulna

N: Radial Nerve

A: Elbow Ext.

Supinator

O: Lateral epicondyle of humerus, annular ligament of proximal radioulnar joint, and ulna

I: Neck and shaft of radius

N: Deep branch of radial nerve

A: FA Supination

Abductor Pollicis Longus

O: Posterior surface of shafts of radius and ulna

I: Base of 1st MCP

N: Deep branch of radial nerve

A: Abducts and extends thumb

Extensor Pollicis Brevis

O: Posterior surface of shaft of radius

I: Base of proximal phalanx of thumb

N: Deep branch of radial nerve

A: Extension of Thumb MCP Jt.

Extensor pollicis longus

O: Posterior surface of shaft of ulna

I: Base of distal phalanx of thumb

N: Deep branch of radial nerve

A: Extends distal phalanx of thumb

Extensor Indicis

O: Posterior surface of shaft of ulna

I: Extensor Expansion of index finger

N: Deep branch of radial nerve

A: Extends MCP Jt. of Index Finger

Abductor Pollicis Brevis

O: Scaphoid, trapezium, flexor retinaculum

I: Base of proximal phalanx of thumb

N: Median Nerve

A: Thumb Abd.

Flexor Pollicis Brevis

O: Flexor Retinaculum

I: Base of proximal phalanx of thumb

N: Median Nerve

A: Flexion fo MCP Joint of Thumb

Opponens Pollicis

O: Flexor Retinaculum

I: Shaft of MCP Bone of Thumb

N: Median Nerve

A: Pulls thumb medially and forward across palm

Abductor Digiti Minimi

O: Pisiform bone

I: Base of Proximal Phalanx of little finger

N: Deep branch of ulnar nerve

A: Abduction of little finger

Flexor Digiti Minimi

O: Flexor Retinaculum

I: Base of proximal phalanx of little finger

N: Deep branch of ulnar nerve

A: Flexion of little finger

Opponens Digiti Minimi

O: Flexor Retinaculum

I: Medial border of 5th MCP

N: Deep branch of ulnar nerve

A: Pulls 5th MCP forward as in cupping the palm