Chapter 12 Wrist Joint

Joint Structure Radiocarpal joint Midcarpal joint Radiocarpal joint – condyloid; biaxial; flex/ext & rad/uln deviation; combination is circumduction - at distal radius is radioulnar disk; scaphoid, lunate, & triquetrum Midcarpal joint – intercarpal; plane joint; nonaxial; gliding CMC joint – connect wrist to hand

Joint Motions Flexion, extension, and hyperextension Radial and ulnar deviation Flexion 0-90; Extension 0-70; hyperextension Radial deviation 0-25; Ulnar deivation 0-35

Bones and Landmarks Radius Styloid process Ulna

Bones and Landmarks Carpal bones Humerus Hook of hamate Medial epicondyle Lateral epicondyle Lateral supracondylar ridge Lateral Supracondylar Ridge - ECRL

Ligaments and Other Structures Radiocarpal joint Radial collateral ligament Ulnar collateral ligament Palmar radiocarpal ligament Dorsal radiocarpal ligament Articular disk Palmar fascia Palmar Fascia - aponeurosis

Muscles of the Wrist Anterior Posterior Flexor carpi ulnaris Flexor carpi radialis Palmaris longus Posterior Extensor carpi radialis longus Extensor carpi radialis brevis Extensor carpi ulnaris

Wrist Joint Anatomical relationships Summary of muscle action Summary of muscle innervation Summary of Muscle Action – Table 12.2 page 168 Summary of muscle innervation – Table 12.3 page 168