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K Wrist Jt

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TermDefinition
the wrist joint is actually made up of two joints: the radiocarpal joint and the midcarpal joint
radiocarpal joint consists of the distal end of the radius and the radioulnar disk proximally and the scaphoid, lunate and triquetrum distally
midcarpal or intercarpal joint are located between the two rows of carpal bones and contribute to wrist motion. their shape is irregular and they are classified as plane joints
carpometacarpal (CMC)joints appear between the distal row of carpal bones and the proximal end of the metacarpal bones
carpal bones starting on the thumb side of the proximal row-scaphoid, lunate, triquetrum, pisiform. in distal row, lateral to medial-trapezium, trapezoid, capitate and hamate
styloid processes distal projection on the lateral side of the radius and distal medial posterior side of the ulna, providing attachment for the collateral ligaments
hook of the hamate projection on the anterior surface of the hamate, providing attachment for the transverse carpal ligament
medial epicondyle located ont he distal medial side of the humerus; attachment for the common flexor tendon
lateral epicondyle located on the distal lateral side of the humerus; attachment for the common extensor tendon
supracondylar ridge located just proximal to the lateral epicondyle; attachment for the extensor carpi radialis longus muscle
there are basically four ligaments of the radiocarpal joint that provide major support of the wrist radial collateral ligament, ulnar collateral ligament, palmar radiocarpal ligament, dorsal radiocarpal ligament
radial collateral ligament attaches to the styloid process of the radius and to the scaphoid and trapezium bones, provides lateral support
ulnar collateral ligament attaches to the styloid process of the ulna and to the pisiform and triquetrum, provides medial support
palmar radiocarpal ligament is a thick, tough ligament that limits wrist extension. it is a broad band that attaches from the anterior surface of the distal radius and ulna to the anterior surface of the proximal carpal bones, and to the capitate bone in distal row
dorsal radiocarpal ligament attaches from the posterior surface of the distal radius to the same surface fo the scaphoid, lunate, and triquetum. limits the amount of flexion allowed at wrist
articular disk located on the distal end of the ulna and articulates with the triquetrum and lunate bones. acts as shock absorber & filler between distal ulna & triquetrum and lunate
palmar fascia relatively thick, triangular fascia located superficially in the palm of the hand. also called palmar aponeurosis
muscles of the wrist (anterior) flexor carpi ulnaris, flexor carpi radialis, palmaris longus (posterior) extensor carpi radialis longus, extensor carpi radialis brevis, extensor carpi ulnaris
the flexors attach... on the medial epicondyle
the extensors attach... on the lateral epicondyle
the distal attachment for all the wrist muscles... is a metacarpal, except for the palmaris longus muscle
the origin of the flexor carpi ulnaris muscle medial epicondyle of humerus
the origin of the flexor carpi radialis muscle medial epicondyle of humerus
the origin of the palmaris longus muscle medial epicondyle of humers
the origin of the extensor carpi radialis longus muscle supracondylar ridge of humerus
the origin of the extensor carpi radialis brevis muscle lateral epicondyle of humerus
the origin of the extensor carpi ulnaris muscle lateral epicondyle of humers
the insertion of the flexor carpi ulnaris muscle pisiform and base of fifth metacarpal
the insertion of the flexor carpi radialis muscle base of second and third metacarpals
the insertion of the palmaris longus muscle palmar fascia
the insertion of the extensor carpi radialis longus muscle base of second metacarpal
the insertion of the extensor carpi radialis brevis muscle base of third metacarpal
the insertion of the extensor carpi ulnaris muscle base of fifth metacarpal
the action of the flexor carpi ulnaris muscle wrist flexion, ulnar deviation
the action of the flexor carpi radialis muscle wrist flexion, radial deviation
the action of the palmaris longus muscle assistive in wrist flexion
the action of the extensor carpi radialis longus muscle wrist extension, radial deviation
the action of the extensor carpi radialis brevis muscle wrist extention
the action of the extensor carpi ulnaris muscle wrist extension, ulnar deviation
nerve that innervates the flexor carpi ulnaris muscle ulnar nerve C8, T1
nerve that innervates the flexor carpi radialis muscle median nerve C6, C7
nerve that innervates the palmaris longus muscle median nerve C6, C7
nerve that innervates the extensor carpi radialis longus muscle radial nerve C6, C7
nerve that innervates the extensor carpi radialis brevis muscle radial nerve C6, C7
nerve that innervates the extensor carpi ulnaris muscle radial nerve C6, C7, C8
an isometric contraction has... relatively no joint motion
the muscle attachments move closer together... with a concentric contraction
an eccentric contraction is a deceleration activity
some lovers try positions that they can't handle scaphoid, lunate, triquetrum, pisiform, trapezium, trapezoid, capitates, hamate
when using a longer lever arm... less force is needed
working against gravity requires more work than ... working with gravity or with gravity eliminated
Created by: jessigirrl4
 

 



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