Functional Anatomy Flashcards
brachial plexus
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Root Trunk Division Cord Branches
What is the relationship of the rotator cuff muscles to the glenohumeral joint that is intact and mobile?
the GH joint depends on the rotator cuff muscles for support, rather than from the bones or ligaments
rotator cuff muscles (4)
supraspinatus
infraspinatus
teres minor
subscapularis
muscles originating from the lateral epicondyle (8)
- anconeus
- brachioradialis
- supinator
- ECRL
- ECRB
- ECU
- EDC
- EDM
muscles originating from the medial epicondyle (5)
- pronator teres
- FCR
- FCU
- palmaris longus
- FDS
palmar wrist ligaments
provide support between the carpal bones
dorsal wrist ligaments
provide support between the carpal bones and the radius
palmar radioscaphoid lunate ligament
provides support for the radius, the scaphoid, and the lunate
triangular fibrocartilage complex (TFCC)
provides support between the carpal bones, the ulna, and the distal radial-ulnar joint
carpal bones (8)
- proximal-distal / radial-ulnar
1. scaphoid
2. lunate
3. triquetrum
4. pisiform
5. trapezium
6. trapezoid
7. capitate
8. hamate
collateral ligaments of fingers
designed to ensure lateral support
*lengthens with flexion and becomes slack with extension
volar plate
protect the joint from hyperextension stresses or dislocations
*slack in flexion and taut with extension
normal resting hand position
wrist 30 deg extension MP and IP 45 deg flexion fingers ABduct and converge toward radius thumb CMC ABduction thumb MP flexion thumb IP extension
tenodesis
in the absence of active muscular contraction, flexion of the fingers and thumb occurs with wrist extension and extension of the fingers and thumb occur with wrist flexion
extensor zones
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