Wrist Muscles and Tendons

Wrist Muscles and Tendons - or ulnarly flex the wrist,...

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Wrist Muscles and Tendons (the name of the muscle usually denotes its function) MUSCLE ACTION Flexors Flexor carpi ulnaris Muscle Action Flexion of wrist; ulnar deviation of wrist Flexor carpi radialis Flexion of wrist; radial deviation of wrist Palmaris longus Tension of the palmar fascia Extensors Extensor carpi radialis longus and brevis Muscle Action Extension of wrist; radial deviation of wrist Extensor carpi ulnaris longus and brevis Extension of wrist; ulnar deviation of wrist Pronators-Supinators Pronator teres Muscle Action Elbow pronation Pronator quadratus Elbow pronation Supinator Elbow supination Brachioradialis Pronation or supination, depending on position of elbow
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Flexor Muscles The proximal attachment of all the wrist/finger flexors is the medial epicondyle of the humerus The distal attachment - they cross over wrist and attach to the metacarpal bones o because of this there is little dynamic stability of the wrist
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Actions – these muscles flex the wrist, and flex the fingers. They also radially flex
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Unformatted text preview: or ulnarly flex the wrist, depending on whether they pass over the wrist on the radial side or the ulnar side. Extensor Muscles The proximal attachment of all the wrist/finger extensor is the lateral epicondyle of humerus The distal attachment - metacarpals Actions these muscles extend the wrist, and extend the fingers. They also radially flex or ulnarly flex the wrist, depending on whether they pass over the wrist on the radial side or the ulnar side. Radial Flexion (also known as Radial Deviation) Is produced by combined actions of: o flexor carpi radialis o extensor carpi radialis longus o adductor pollicis longus (thumb) Ulnar Flexion (also known as Ulnar Deviation) Is produced by combined actions of: o extensor carpi ulnaris o flexor carpi ulnaris Tendons of Wrist Muscles Have sustained amplitudes of excursion: o 37mm - extensor carpi radialis brevis o 50 mm - pronator teres...
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This note was uploaded on 09/25/2010 for the course EXS 31757 taught by Professor Brennan during the Spring '10 term at Oakland University.

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Wrist Muscles and Tendons - or ulnarly flex the wrist,...

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