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

• School: Western University
• Department: Anatomy and Cell Biology
• Course: Anatomy and Cell Biology 3319
• Professor: Peter Merrifield

Document Summary

Lecture 27: upper extremities 4 muscles of the forearm: posterior compartment & intrinsic muscles of the hand. Describe 9 muscles of posterior compartment of forearm (table 11. 13) Describe general organization of intrinsic muscles of hand. Describe 4 intrinsic muscles of the hand that move the thumb. From the carpal bones, they connect to the five metacarpals, which connect to the proximal phalanges via the metacarpophalangeal joint middle distal phalange (except the thumb) Be aware that the muscles of forearm posterior compartment will extend the hand (giving high-five), while the flexor muscles flex the hand (beckoning someone to come) Only 2 layers: superficial & deep: superficial, extensor carpi radialis brevis, extensor carpi radialis longus, extensor carpi ulnaris, extensor digitorum, brachioradialis. Extensor carpi radialis longus: o: lateral supracondyle ridge of humerus. I: base of 2nd metacarpal (index: a: extends and abducts hand at wrist joint (crosses elbow & wrist) Extensor carpi radialis brevis: o: lateral epicondyle of humerus.