the hand and wrist- structure and function. the hand - it’s role u prehension - opposition of the...
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The Hand and Wrist- Structure and Function
The Hand - It’s Role Prehension - Opposition of the thumb Effector organ of the upper limb Very sensitive and accurate sensory
receptor Communicates with the brain about
thickness and distance Stereognosis
Prehension Gripping ability Tarsier can grip with
tail and hand
Braciation Upper limb used as a
means of locomotion
The Radiocarpal joint 1. Articulation
between the lower end of the radius and the proximal row of carpal bones
2.Intercarpal joints
The carpal bones Bones in the shape of
a gutter Concave anteriorly Flexor retinaculum
forms a tunnel - carpal tunnel
The muscles of the wrist Anterior aspect
flexor carpi radialis palmaris longus flexor carpi ulnaris flexor digitorum
profundus flexor digitorum
superficialis flexor pollicis longus
The muscles of the wrist Posterior aspect
extensor carpi ulnaris extensor carpi radialis
brevis extensor carpi radialis
longus
Regions of the hand - functionally divided
The thumb - opposition
The index and middle finger
The ring and little fingers
Muscles of the Hypothenar Eminence
Muscle of the Hypothenar eminence
Flexor digiti minimi Adductor digiti
minimi Opponens digiti
minimi
Muscles of the thenareminence
Extrinsic muscles Abductor pollicis
longus Extensor pollicis
brevis Extensor pollicis
longus
Intrinsic muscles Flexor pollicis brevis Opponens pollicis Abductor pollicis Abductor pollicis
brevis Anterior interosseus Adductor pollicis
The intrinsic muscles of the hand Lumbricals (2nd-5th finger)
• attachments on the tendons of flexor digitorum profundus
• insert onto extensor apponeurosis Interossei
• dorsal abduct (dab)• palmar adduct (pad)