Muscles of the Cubital Region

Question 1

Supinator

Answer 1

O: lateral epicondyle of humerus; radial collateral and annular ligaments; supinator fossa and crest of ulna

I: lateral, posterior, anterior surfaces of proximal 1/3 of radius

A: supinates pronated arm

N: deep branch of radial n. (C7, C8)

Question 2

Brachioradialis

Answer 2

O: proximal 2/3 of lateral supraepicondylar ridge of humerus

I: lateral surface of distal end of radius to styloid process

A: flexes forearm

N: Radial n. (C5, C6, C7)

Question 3

Pronator Teres

Answer 3

O: medial epicondyle of humerus and coronoid process of ulna

I: middle of lateral surface of radius

A: pronates forearm and assists in flexion of of forearm

N: median n. (C6, c7)