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K Wrist Jt
book
| Term | Definition |
|---|---|
| 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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