BIOL 2005 Lecture Notes - Extensor Digiti Minimi Muscle, Hypothenar Eminence, Abductor Digiti Minimi Muscle Of Hand

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Interlocking of bony surfaces => only flexion and extension: medial: ulnar collateral ligament, lateral: annular ligament, flexion is unrestrained; extension restrained by olecranon, flexor m: brachialis (primary), biceps brachii (primary), brachoraidalis, Pronator teres: extensor m: triceps brachii (posterior compartment) Wrist joint: flexion/extension (radiocarpal & intercarpal joints, flexor. Muscles: pass anterior to mediolateral axis, muscles: flexor carpi radialis, palmaris longus, flexor carpi, posterior to mediolateral axis, muscles: extensor carpi radialis longus/ brevis, extensor carpi, extensor ulnaris. Muscles ulnaris: abduction/adduction (occurs about anteroposterior axis, abduction (radial deviation, flexor carpi radialis, extensor carpi radialis longus/ brevis, abductor pollicis longus, adduction (ulnar deviation) 1. flexor carpi ulnaris, extensor carpi ulnaris: palmaris longus not an abductor or adductor b/c it passes directly thru the axis of rotation. Carpometacarpal & intermetacarpal joints: generally severely restricted in movement due to ligaments, no muscles work on these joints except for digits 1 & 5, digit 1 & 5 have opponens muscles which act to move digits in opposition.

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