22. The Hand Flashcards
What type of joint are the interphalangeal joints?
Synovial hinge
What type of joint are the metacarpophalangeal joints?
Synovial condyloid
What type of joint are the carpometacarpal joints?
Thumb - synovial saddle
Digits - synovial plane
What type of joint are the intercarpal joints?
Synovial plane
What muscle tenses the palmar aponeurosis?
Palmaris longus
Origin of palmaris brevis?
Palmar aponeurosis
Flexor retinaculum
Insertion of palmaris brevis?
Dermis
Function of palmaris brevis?
Grip
Innervation of palmaris brevis?
Superficial ulnar nerve C8, T1
What are the muscles at the thenar eminance?
Abductor pollicis brevis
Flexor pollicis brevis
Opponens pollicis
Origin of abductor pollicis brevis?
Scaphoid
Trapezium
Insertion of abductor pollicis brevis?
Base of proximal phalanx of thumb
Function of abductor pollicis brevis?
CMC joint abduction
Innervation of abductor pollicis brevis?
Recurrent median nerve C8, T1
Origin of flexor pollicis brevis?
,Flexor retinaculum
Capitate
Trapzium
Insertion of flexor pollicis brevis?
Base of proximal phalanx of thumb
Function of flexor pollicis brevis?
CMC joint flexion
Innervation of flexor pollicis brevis?
Recurrent median nerve C8, T1
Origin of opponens pollicis?
Trapezium
Insertion of opponens pollicis?
First metacarpal
Function of opponens pollicis?
CMC joint opposition
Innervation of opponens pollicis?
Recurrent median nerve C8, T1
Origin of adductor pollicis?
Transverse head - 3rd metacarpal
Oblique head - capitate and 2nd/3rd metacarpals
Insertion of adductor pollicis?
Base of proximal phalanx of thumb
Function of adductor pollicis?
Adduction of CMC joint of thumb
Flexion of MCP joint of thumb