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Wrist movements
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Proximal attachments
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Wrist movements Flexion: Anterior muscle Extension:Posterior muscle Radial deviation: lateral muscle Ulnar deviation: medial muscle.
Proximal attachments Flexors: all originate at the medial epicondyle(medial muscle mass) Extensor: all originate at lateral epicondyle(lateral muscle mass)
Distal attachments All attach to a metacarpal
The 3rd metacarpal The midline of hand
Anterior muscles (Flexor Carpi radials, palmaris, longus Flexor Carpi ulnaris) work together to do straight wrist flexion.
Posterior muscles (Extensor Carpi radialis Longus, Extensor Carpi radialis, Extensor Carpi ulnaris) = straight wrist extension.
Muscle compartments Brachioradialis divides the extensor and flexors/ The belly of extensor Carpi radialis longus lies next to brachioradialis.
Radial and ulnar deviation: Flexor Carpi radialis and extensor Carpi radialis longus will produce Pure radial deviation
Radial and ulnar deviation: Flexor Carpi ulnaris and extensor Carpi ulnaris will produce Pure Ulnar deviation
Radial deviation Flexor Carpi radialis Extensor Carpi radialis longus and brevis (Flexion and extension component is neutralized) = Get pure radial deviation.
Ulnar deviation Flexor Carpi ulnaris Extensor Carpi ulnaris (The flexion and extension component) Get pure ulnar deviation.
Finger and thumb muscles Extrinsic muscles=muscle belly outside joint: assist with wrist motion-primary action on digit.
Distal radioulnar joint is where Head of ulna articulates with ulnar notch on radius dismally
Proximal and distal radioulnar joints are: Mechanically linked and motion at one is always accompanied by motion at the other.
Pronation and supination occur because Radius crosses ulna at radioulnar joint: it slides over ulnar head.
Created by: Kenito71
 

 



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