Hand Flashcards
Sensory innervation palm
Superficial radial - C6 to lateral border
Palmar cutaneous of median N - c6&c7 to lateral 2/3 of palm
Median digital N - lateral 3.5 fingers from C6&C7
Palmar cutaneous of Ulnar N - medial 1/3 of palm from C7&C8
Ulnar Digital N- med 1.5 fingers from C7&C8
Dorsal sensory innervation
Superficial radial - C6 &
C6 to lateral 2/3 and lateral 3.5 fingers up to PIP
Median digital N - lateral 3.5 fingers distal to PIP from C6&C7
Dorsal cutaneous of Ulnar N - medial 1/3 of palm and fingers up to PIP from C7&C8
Ulnar Digital N- med 1.5 fingers distal to PIP from C7&C8
Abductor policis brevis
O: lateral carpal bone + flexor retinaculum
I: proximal phalynx lateral aspect
I: recurrant branch median N
Abduction thumb
Flexor policis brevis
O: lateral carpal bone + flexor retinaculum
I: superficial and deep head insert to proximal phalynx of thumb
I: superficial: recurrant branch median N
Deep: deep ulnar N
Flex thumb
Opponens pollicis
O: lateral carpal bone + flexor retinaculum
I: anterior lateral surface 1st MC
I: recurrant branch median N
Prime opposition of thumb
Flexor digiti minimi brevis
O: medial carpal bone + flexor retinaculum
I: proximal phalynx digit 5
I: deep ulnar
Flex digit 5
Abductor digit minimi
O: medial carpal bone + flexor retinaculum, FCU
I: medial side proximal phalynx digit 5
I: deep ulnar
Prime abductor digit 5
Palmaris brevis
O: palmaris aponeurosis, palmaris longus tendon, flexor reticulum
I: deep surface skin on medial margin of hand
I: deep ulnar
Makes cup shape
Not everyone has this muscle
Opponens digiti minimi
O: medial carpal bone + flexor retinaculum
I: med border 5th MC
I: deep ulnar
Lateral rotate 5th digit
Adductor pollicis
O: oblique head - lateral carpal bone + base 2&3rd MC
Transverse head - head and shaft 3rd MC
I: medial side proximal phalynx thumb
I: deep ulnar
Prime adductor
Lumbricals
O: FDP tendon
I: DDE 2-5
I: lateral: direct branch of median N
Medial: deep ulnar N
Flex MCP while keeping DIP and PIP in extended
Palmar interossei
O: med to 2nd MC, lateral to 4&5 MC bone
I: DDE 2,4,5
I: deep ulnar N
2,4,5
Dorsal interossei
O: adjacent surface Mc bones
I: DDE 2,3,4
I: deep ulnar N
Abductor 2,3,4 digit
Superficial Radial and Ulnar A pathway in hand
Ulnar N splits into superficial and deep + dorsal carpal branch after tunnel of guyon
Superficial Radial A branches of Radial A before entering the hand
Superficial ulnar A makes superficial palmar arch with superficial Radial A (though it’s not always present)
- branches from here are common palmar digital —> proper palmar digital A
Deep radial and ulnar A pathway
Ulnar A splits into deep artery after tunnel of guyon
Radial A wraps around lateral wrist through snuff box —> travels between 1st dorsal interossei and then between transverse and oblique head adductor policis before showing up on palm as deep radial
The two deep branches from the deep palmar arch (more contribution from Radial A)
- branches into palmar metacarpal A which meets with common palmar digital A to supply finger via proper palmar digital A
