Anatomy and Cell Biology 3319 Study Guide - Midterm Guide: Humerus, Anatomical Terms Of Motion, Metacarpal Bones
6 Feb 2017
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Lab 13 - superficial muscles of the posterior forearm. Extensor carpi radialis longus: origin: lateral supracondylar ridge of humerus. Extensor carpi radialis brevis: origin: lateral epicondyle of humerus. Innervation: radial nerve: action: extends and abducts the hand. Extensor digitorum: origin: lateral epicondyle of humerus. Insertion: by four tendons into extensor expansions and distal phalanges of fingers ii-v. Innervation: radial nerve: action: extends the hand, proximal, middle, and distal phalanges (fingers) Extensor carpi ulnaris: origin: lateral epicondyle of humerus and posterior border of ulna. Innervation: radial nerve: action: extends and adducts the hand. Supinator: origin: lateral epicondyle of humerus; proximal ulna. Innervation: radial nerve: action: supination of forearm, refer to images at end of hand-out. Abductor pollicis longus: origin: posterior surface of radius and ulna; interosseous membrane. Innervation: radial nerve: action: adducts the thumb (and extends it) Extensor pollicis brevis and longus: origin: dorsal shaft of radius and ulna; interosseous membrane.
