HN210 Study Guide - Midterm Guide: Epicondyle, Carpal Bones, Metacarpal Bones
Document Summary
The stabilizing bone of the forearm: thick shaft proximally. The ulna does not articulate directly with carpal bones separated by fibrocartilaginous disc. Radial head also articulates with radial notch on ulna. Radial styloid process is alrger than the ulna"s & extends farther distally: relationship is important when the ulna/radius fracture. Flexion (fist) is extension of the fingers (abduction) Flexors & pronators are mainly in the anterior compartment. Served mostly by the median nerve (thumb, index, middle) & the ulnar nerve (ring, pinky) Flexors: o: medial epicondyle origin of most of the flexor in forearm, travel: along medial border & anterior surface of forearm, continue into palm. 4 layers of muscles: superficial: pronator teres, flexor carpi radialis, palmaris longus, flexor carpi ulnaris, intermediate: flexor digitorum superficialis, deep: flexor digitorum profundus, flexor pollicis longus, pronator quadratus. Pronator teres: origin: medial epicondyle & coronoid process of ulna, action: pronation, flexion of the forearm (if muscle contracts, radius rolls medially)
