Fall 2026 UE Exam II

PA; Supinator

Lateral epicondyle of humerus, radial collateral and annular ligaments, supinator fossa, crest of ulna

DA; Supinator

Lateral, posterior, anterior surfaces of the proximal 1/3rd of radius

A: Supinator

Forearm supination

N: Supinator

Radial (deep branch) C8

PA: Pronator Teres

Ulnar head: Coronoid process of ulnar, Humeral head: medial epicondyle of humerus (common flexor origin)

DA: Pronator Teres

Lateral mid shaft of the radius

A: Pronator Teres

Forearm pronation, elbow flexion

N: Pronator Teres

Median C7

PA: Pronator Quadratus

Distal ¼ of anterior surface of ulna

DA: Pronator Quadratus

Distal ¼ of anterior surface of radius

A: Pronator Quadratus

Forearm pronation. Deep fibers bind radius and ulna together.

N: Pronator Quadratus

Median (anterior interosseous) C8

PA: Brachioradialis

Proximal 2/3 of lateral supra-epicondylar ridge of humerus

DA: Brachioradialis

Lateral surface of distal end of radius proximal to styloid process

A: Brachioradialis

Elbow flexion (maximal in mid-pronated position)

N: Brachioradialis

Radial C6

PA: Extensor Carpí Radialis Longus

Lateral supra-epicondyle ridge of humerus

DA: Extensor Carpí Radialis Longus

Dorsal aspect of base of 2nd metacarpal

A: Extensor Carpí Radialis Longus

Wrist extension, radial deviation

N: Extensor Carpí Radialis Longus

Radial C6,C7

PA: Extensor Carpí Radialis Brevis

Lateral epicondyle of humerus (common extensor origin)

DA: Extensor Carpí Radialis Brevis

Dorsal aspect of base of 3rd metacarpal

A: Extensor Carpí Radialis Brevis

Wrist extension, radial deviation

N: Extensor Carpí Radialis Brevis

Radial (deep branch) C7

PA: Flexor Carpi Radialis

Medial epicondyle (common flexor origin)

DA: Flexor Carpi Radialis

Base of 2nd metacarpal

A: Flexor Carpi Radialis

Wrost flexion, radial deviation

N: Flexor Carpi Radialis

Median C7

PA: Abductor Pollicis Brevis

Flexor retinaculum and tubercle of scaphoid and trapezium

DA: Abductor Pollicis Brevis

Lateral side of base of proximal phalanx of 1st digit

A: Abductor Pollicis Brevis

CMC abduction and opposition of 1st digit

N: Abductor Pollicis Brevis

Median (recurrent branch) C8

PA: Dorsal Interossei

Adjacent sides of 2 metacarpals (bipennate)

DA: Dorsal Interossei

Base of proximal phalanx and extensor expansions of digits 2-4. 1&2: radial side of digits 2&3, 3&4: ulnar side of digits 3&4

A: Dorsal Interossei

Abduction of digits 2,3,4 from axial line and assists lumbricals with MP flexion, PIP, DIP extension

N: Dorsal Interossei

Ulnar (deep branch) T1

PA: Flexor Carpi Ulnaris

Humeral head: medial epicondyle of humerus (common flexor origin), ulnar head: olecranon and posterior border of ulna (via aponeurosis)

DA: Flexor Carpi Ulnaris

Pisiform, hook of hamate, 5th metacarpal

A: Flexor Carpi Ulnaris

Wrist flexion, ulnar deviation

N: Flexor Carpi Ulnaris

Ulnar C8