24: UE Myology: Hand Flashcards
Abductor pollicis brevis O and I
O: scaphoid, trapezium, flexor retinaculum
I: proximal phalanx of pollux
Abductor pollicis brevis A
Abduct pollux, opposition
Abductor pollicis brevis N
Recurrent branch of median N
Opponens pollicis O and I
O: scaphoid, trapezium, flexor retinaculum (same as abductor pollicis brevis)
I: lateral 1st metacarpal
Opponens pollicis N
Recurrent branch of median N
What movement can be lost with even a very superficial palm injury resulting in damage to the median N?
Opposition of the thumb
Flexor pollicis brevis O and I
O: scaphoid, trapezium, flexor retinaculum
I: proximal phalanx of pollux
Flexor pollicis brevis A
Flex 1st metacarpal and proximal phalanges of pollux
Flexor pollicix brevis N (two heads)
Superficial head: recurrent branch of median N
Deep head: deep ulnar N
Adductor pollicis O and I (two heads)
Oblique head O: capitate, 2nd and 3rd metacarpal bases
Transverse head: 3rd metacarpal
I: proximal phalanx of pollux
Adductor pollicis A
Adduct pollux
Adductor pollicis N
Deep ulnar N
Innervation to hypothenar eminence
Deep ulnar N
Abductor digiti minimi O and I
O: pisiform
I: proximal phalanx of 5th digit
Abductor digiti minimi A
Abduct 5th digit
Flexor digiti minimi brevis O and I
O: hook of hamate, flexor retinaculum
I: proximal phalanx 5th digit
Flexor digiti minimi brevis A
Flex 5th digit
Opponens digiti minimi O and I
O; hook of hamate, flexor retinaculum
I: medial 5th metacarpal
1st and 2nd lumbrical O and I
O: lateral side of lateral 2 flexor digitorum profundus tendons
I: radial aspect of extensor expansion of 2nd and 3rd digits
Difference in shape of 1st/2nd vs 3rd/4th lumbricals
1st and 2nd: unipennate
3rd and 4th: bipennate
3rd and 4th lumbrical O and I
O: between medial 3 flexor digitorum profundus tendons
I: radial aspect of extensor expansions of 4th and 5th digits
Lumbrical A
Flex proximal phalanges, extend intermediate and distal phalanges by tightening extensor expansion
1st and 2nd lumbrical innervation vs 3rd and 4th
1st and 2nd: median N
3rd and 4th: deep ulnar N
Dorsal interossei O and I
O: adjacent sides to 2 metacarpals (bipennate)
I: proximal phalanges 2-4, extensor expansions
Dorsal interossei A
Abducts digits 2-4, flex proximal phalanges, extend intermediate and distal phalanges
Dorsal and palmar interossei N
Deep ulnar N
Palmar interossei O and I
O: palmar aspect of 2nd, 4th, and 5th metacarpals
I: proximal phalanges 2, 4, 5 + thier extensor expansions
Palmar interossei A
Adduct 2,3,5 digits, flex proximal digits and extend intermediate and distal phalanges
Two muscle groups involved in the power grip (palm grasp)
Long flexors of the digits + intrinsic hand muscles
What muscle group is used for the hook grip?
Long flexors of digits
Three groups of muscles active in precision handling grip (like using a pen)
Long flexors, long extensors, intrinsic hand muscles
