Arm + Forearm

Biceps Brachii

A- elbow flexion and supination

O- (long head) supraglenoid tubercle of the scapula, (short head) coracoid process of scapula

I- radial tuberosity and antebrachial fascia

Inn- musculocutaneous nerve (sometimes radial nerve)

Brachialis

A- elbow flexion

O- anterior aspect of the humerus

I- tubersosity of ulna

Inn- musculocutaneous nerve

Coracobrachialis

A- adduct shoulder, shoulder flexion, supination

O- coracoid process of scapula

I- medial shaft of the humerus

Inn- musculocutaneous nerve

Triceps Brachii

A- extend forearm

O- (long head) infraglenoid tubercle of the scapula, (medial and lateral heads) posterior surface of the humerus above and below the radial groove

I- olecranon process of ulna

Inn- radial nerve

Blood supply- deep artery of the arm

Anconeus

A- assist extension

O- lateral epicondyle of the humerus

I- lateral surface of the olecranon and posterior surface of the proximal ulna

Inn- radial nerve

Blood- deep artery of the arm

Pronator Teres

A- pronates forearm

O- humeral head, common flexor tendon and medial supracondyle ridge, ulnar head, coronoid prcess

I- lateral radius, mid-shaft

Inn- median nerve

Blood supply- radial and ulnar arteries

Flexor Carpi Radialis

A- flexes wrist abducts (radially deviates) the hand

O- common flexor tendon

I- base of 2nd and 3rd metacarpal

Inn- median nerve

Blood supply- radial and ulnar arteries

Palmaris Longus

A- weakly flexes wrist and assists with grip

O- common flexor tendon

I- palmar aponeurosis of the hand

Inn- median nerve

Blood supply- radial and ulnar arteries

Flexor Carpi Ulnaris

A- flex wrists and adducts hand/ulnar deviation

O- common flexor tendon, ulnar head from postermedial ulna

I- pisiform, hook of hamate, base of 5th metacarpal

Inn- ulnar neve

Blood supply- radial and ulnar arteries

Brachioradialis

A- flexes elbow, particularly when forearm is neutral, weak pronation, supination

O- lateral supracondylar ridge

I- radial styloid process

Inn- radial n.

Blood supply- radial and ulnar arteries

Flexor Digitorum Superficialis

A- flexes MCPs and PIPs 2-5, wrist flexion

O- (humeroulnar head) common flexor tendon and coronoid process of ulna, (radial head) arises from the anterior surface of the radius

I- shafts of the middle phalanges of digits 2-5

Inn- median nerve

Blood supply- radial and ulnar arteries

Flexor Digitorum Profundus

A- flexes MCPs, DIPS, and PIPs 2-5

O- anteromedian surface of the ulna, the interosseous membrane

I- base of the distal phalanx of digits 2-5, after passing though the split in FDS tendons Inn- 1/2 median (radial side) and 1/2 ulnar (ulnar side) nerves

Blood supply- radial and ulnar arteries

Flexor Pollicus Longus

A- flexes 1st GNC, MCP, IP joints

O- anterior surface of radius and interosseous membrane

I- base of distal phalanx of thumb

Inn- median n.

Blood supply- radial and ulnar arteries

Pronator Quadratus

A- pronates forarm

O- medial distal forearm

I- distal radius

Inn- median nerve

Blood supply- radial and ulnar arteries

Extensor Carpi Radialis Longus

A- wrist extension and abduction

O- lateral supracondylar ridge

I- base of 2nd metacarpal

Inn- radial nerve

Blood supply- radial artery and posterior interosseus artery off ulnar artery

Extensor Carpis Radialis Brevis

A- wrist extension and abduction

O- common extensor tendon

I- base of 3rd metacarpal

Inn- radial nerve (deep branch)

Blood supply- radial artery and posterior interosseus artery off ulnar artery

Extensor Digitorum

A- extends MCPs, DIPS, PIPS of 2-5, wrist extension

O- common extensor tendon

I- through the "extensor expansion/hood" inserts on dorsal center of middle phalanx both sides of distal phalanx of digits 2-5

Inn- radial nerve (posterior interosseous n.)

Blood supply- radial artery and posterior interosseus artery off ulnar artery

Extensor Digiti Minimi

A- extends MCP, DIP, PIP of 5

O- common extensor tendon

I- extensor expansion of digit 5

Inn- radial nerve (posterior interosseous nerve)

Blood supply- radial artery and posterior interosseus artery off ulnar artery

Extensor Carpi Ulnaris

A- wrist extension and adduction

O- (humeral head) common extensor tendon, (ulnar head) posterior ulna

I- base of 5th metacarpals

Inn- radial nerve (posterior interosseuous)

Blood supply- radial artery and posterior interosseus artery off ulnar artery

Supinator

A- supination

O- (humeral head) lateral epicondyle, (ulnar head) ulna at supinator crest

I- lateral, proximal radius

Inn- radial nerve (deep branch)

Blood supply- radial artery and posterior interosseus artery off ulnar artery

Abductor Pollicis Longus

A- 1st CMC abduction

O- posterior radius, ulna, interosseuos membrane

I- base of 1st metacarpal

Inn- radial nerve (posterior interosseous n)

Blood supply- radial artery and posterior interosseus artery off ulnar artery

Extensor Pollicis Brevis

A- 1st MCP extension

O- posterior distal ulna and interosseous membrane

I- base of proximal phalanx of thumb

Inn- radial nerve

Blood supply- radial artery and posterior interosseus artery off ulnar artery

Extensor Pollicis Longus

A- 1st CMC, MCP, and IP extension

O- posterior distal ulna and interosseous membrane

I- base of distal phalanx of thumb

Inn- radial nerve (posterior interosseous n)

Blood supply- radial artery + posterior interosseous artery off the ulna

Extensor Indicis

A- extends MCP, PIP, DIP of index finger

O- posterior distal ulna and interosseous membrane

I- extensor hood of 2nd digit

Inn- radial nerve (posterior intersseous)

Blood supply- radial artery and posterior interosseus artery off ulnar artery