| Muscle | |
| Brachialis | O: anterior distal half of humerus
I: coronoid process and tuberosity of ulna
A: flex forearm at elbow
Musculocutaneous Nerve C5-C6 |
| Biceps Brachii | O: LH-supraglenoid tubercle of scapula
SH- coracoid process of scapula
I: radial tuberosity and bicipital aponeurosis to fascia on medial side of forearm
A: weakly flex arm at shoulder
flex and supinate forearm
Musculocutaneous Nerve C5-C7 |
| Brachioradialis | O: lateral supracondylar ridge of humerus
I: styloid process of radius
A: flex forearm at elbow
Radial Nerve C5-C6 |
| Triceps Brachii
LONG HEAD | O: infraglenoid tubercle of scapula
I: posterior olecranon process of ulna
A: extend arm at shoulder
extend forearm at elbow
Radial Nerve C7-C8 |
| Triceps Brachii
MEDIAL HEAD | O: inferior 2/3 of posterior humerus
I: posterior olecranon process of ulna
A: extend forearm at elbow
Radial Nerve C7-C8 |
| Triceps Brachii
LATERAL HEAD | O: proximal portion of posterior humerus superior to radial groove
I: posterior olecranon process of ulna
A: extend forearm at elbow
Radial Nerve C7-C8 |
| Anconeus | O: lateral epicondyle of humerus
I: posterior olecranon process of ulna
A: extend forearm at elbow
Radial Nerve C7-C8 |
| Pronator Teres | O: HH- medial epicondyle of humerus and distal supracondylar ridge
UH- medial side of coronoid process of radius
I: middle of lateral surface of radius
A: pronate and flex forearm
Median Nerve C6-C7 |
| Flexor Carpi Ulnaris (FCU) | O: medial epicondyle of humerus
I: pisiform, hook of hamate, and bade of 5th metacarpal
A: flex and ulnar deviates hand
Ulnar Nerve C8-T1 |
| Flexor Carpi Radialis (FCR) | O; medial epicondyle of humerus
I: bases of 2nd and 3rd metacarpals
A: flex and radial deviates hand
Median Nerve C6-C7 |
| Palmaris Longus (PL) | O: medial epicondyle of humerus
I: flexor retinaculum and palmar aponeurosis
A: flex hand and tense palmar aponeurosis
Median Nerve C7-C8 |
| Extensor Carpi Radialis Longus (ECRL) | O: distal lateral supracondylar ridge
I: base of 2nd metacarpal (dorsal surface)
A: extends and radial deviates hand
Radial Nerve C6-C7 |
| Extensor Carpi Radialis Brevis (ECRB) | O: lateral epicondyle of humerus
I: base of 3rd metacarpal (dorsal surface)
A: extend and radial deviate hand
Radial Nerve C6-C7 |
| Extensor Carpi Ulnaris (ECU) | O: lateral epicondyle of humerus
I: base of 5th metacarpal (dorsal surface)
A: extend and ulnar deviates hand
Radial Nerve C6-C8 |
| Flexor Digitorum Superficialis (FDS) | O: HUH- medial epicondyle of humerus and coronoid process of ulna
RH- upper anterior surface of radius
I: middle phalanges of digits 2-5
A: flex middle phalanges; if continues, flexes proximal phalanges, hand, and forearm
Median Nerve C7-T1 |
| Extensor Digitorum | O: lateral epicondyle of humerus
I: distal phalanges via dorsal mechanism of digits 2-5 (extensor expansion)
A: extend wrist and fingers 2-5 (middle phalanx)
Deep Branch of Radial nerve C6,C8 |
| Pronator Quadratus | O: medial side of anterior surface of distal 1/4 ulna
I: lateral side of distal 1/4 radius
A: pronate forearm
Anterior Interosseous Branch of Median Nerve C8-T1 |
| Supinator | O: lateral epicondyle of humerus, annular and radial collateral ligaments, and supinator crest of ulna
I: lateral surface of upper 1/3 of body of radius
A: supinates forearm
Radial Nerve C6 |
| Flexor Digitorum Profundus (FDP) | O: medial and anterior surfaces of proximal 3/4 of ulna and interosseous membrane
I: by 4 tendons into the anterior surface of distal phalanges 2-5
A: flex distal IP joints 2-5, adduct 2,4,5 and flex hand
Ulnar Nerve; Interosseous Branch Median C7-T1 |
| Extensor Indicis | O: interosseous membrane and posterior surface of ulna
I: into extensor expansion (dorsal surface) of proximal phalanx of index finger
A: extend index finger at MCP joint
Posterior Interosseous Branch of Radial Nerve C6-C8 |
| Extensor Digiti Minimi (EDM) | O: common tendon from lateral epicondyle of humerus
I: dorsal surface base of distal phalanx of 5th finger
A: extend 5th finger
Radial Nerve C6-C8 |
| Flexor Pollicis Longus (FPL) | O: middle of anterior shaft of radius and interosseous membrane
I: palmar surface of base of distal phalanx of thumb
A: flex thumb; assist abduction of wrist
Anterior Interosseous Branch of Median Nerve C8-T1 |
| Abductor Pollicis Longus (APL) | O: Posterior surface of body of ulna distal to origin of supinator, interosseous membrane, middle 1/3 body of radius
I: dorsal surface base of 1st met
A: abduct and extend 1st finger; abduct wrist
Posterior Interosseous Branch Radial Nerve C6-C8 |
| Extensor Pollicis Brevis (EPB) | O: distal 1/3 dorsal surface of radius and adjacent part of interosseous membrane
I: base of proximal phalanx of thumb
A: extend thumb; abduct hand
Radial Nerve C6-C7 |
| Extensor Pollicis Longus (EPL) | O: inteross mem. and middle 1/3 posterior surface of ulna
I: dorsal surface base of distal phalanx of thumb
A: extend IP joint, assist extension MCP joint, assist abduction/extension wrist, lat rotation thumb
Post. Interos. Branch Radial Nerve C6-C8 |