Anatomy and Cell Biology 3319 Lecture Notes - Lecture 21: Ulnar Nerve, Hypothenar Eminence, Opponens Pollicis Muscle

• School: Western University
• Department: Anatomy and Cell Biology
• Course: Anatomy and Cell Biology 3319
• Professor: Steve Laviolette

Document Summary

Jan 17 upper extremity 4 = muscles of the forearm: posterior compartment and intrinsic muscles of hand. Some lovers try positions that they cannot handle: s: scaphoid, l: lunate, t: triquetrum, p: pisiform, t: trapezium, t: trapezoid, c: capitate, h: hamate. Posterior compartment of the forearm has superficial and deep layer (anterior had 3 layers) Superficial: extensor carpi radialis longus, extensor carpi radialis brevis, extensor digitorum (extdigit minimi, extensor carpi ulnaris, brachioradialis. Supinator: abductor pollicis longus ** pollicis = thumb, extensor pollicis longus, extensor indicis ** indicis = index finger, extensor pollicis brevis. Action: extends and abducts hand at wrist joint. Extensor digitorum (extdigit minimi) strong and large. Action: extends the medial 4 fingers at the metacarpophalangeal joints and extends hand at wrist joint. Innervation: posterior interosseous nerve which is a continuation of deep branch of radial nerve (c7c8) ** diagram should have it going to little finger too. ** nerve popping through interosseous membrane to posterior compartment.