Anatomy and Cell Biology 3319 Lecture Notes - Lecture 27: Extensor Pollicis Brevis Muscle, Extensor Pollicis Longus Muscle, Extensor Carpi Ulnaris Muscle

• School: Western University
• Department: Anatomy and Cell Biology
• Course: Anatomy and Cell Biology 3319
• Professor: Michele Barbeau

Document Summary

Review: bony features of the hand and wrist. Extensor / supinator muscles of posterior compartment of forearm. Innervation: radial nerve (c6-c7: extensor carpi radialis brevis: superficial. Action: extends and abducts hand at wrist joint. Innervation: deep branch of radial nerve (c7-c8: extensor digitorum: superficial. Action: extends the medial 4 fingers at the metacarpophalangeal joints, extends hand at wrist joint. Innervation: posterior interosseous nerve which is a continuation of deep branch of radial nerve (c7-c8: extensor carpi ulnaris: superficial. Origin: lateral epicondyle of humerus, posterior border of ulna. Action: extends and adducts hand at wrist joint. Innervation: posterior interosseous nerve which is a continuation of deep branch of radial nerve (c7-c8: brachioradialis: supericial. Insertion: lateral surface of distal end of radius. Action: flexes forearm, synergizes w other forearm flexors. Note: of the muscles that receive innervation from the radial nerve, brachioradialis is 1 of only 4 that.