Wrist and Palm Flashcards
surface anatomy
what is the crease at the base of the fingers called?
interdigital fold
surface anatomy
What are the 2 areas at the base of the palm called?
hypothenar eminence
thenar eminence
name the carpal bones
scaphoid
lunate
triquetrum
pisiform
trapezium
trapezoid
capitate
hamate
“Some Lovers Try Positions That They Can’t Handle”
Describe the cutaneous innervation of the palm by the ulnar nerve
5th digit & 1/2 of 4th digit
(tea fingers)
Describe the cutaneous innervation of the palm by the median nerve
1st, 2nd, 3rd digits, 1/2 of 4th digit
(tea fingers)
Describe the cutaneous innervation of the palm by the radial nerve
superficial branch of radial n innervates small area of proximal thenar eminence area
C8 dermatome of the palm
4th & 5th digits
C7 dermatome of the palm
3rd (middle) digit
C6 dermatome of the palm
1st & 2nd digits
how do palmar branches of the ulnar & median nerves travel in the wrist?
do not pass under flexor retinaculum or through carpal tunnel
describe the cutaneous innervation of the palm by the lateral antebrachial cutaneous nerve
lateral/radial aspect of wrist
cutaneous innervation of the palm
palmar branches of the median and ulnar nerves supply cutaneous innervation to…
base of palm (ulnar side and medial palm)
origin of palmaris brevis
palmar aponeurosis & flexor retinaculum
insertion of palmaris brevis
skin of ulnar side of palm
innervation of palmaris brevis
superficial branch of ulnar nerve
action of palmaris brevis
wrinkles & tenses skin over hypothenar eminance
where does flexor retinaculum attach medially?
hook of hamate & pisiform
where does flexor retinaculum attach laterally?
scaphoid & trapezium
what structure forms the roof of the carpal tunnel?
flexor retinaculum
what structure forms the lateral border of the carpal tunnel?
tubercles of scaphoid & trapezium
what structure forms the medial border of the carpal tunnel?
hook of hamate & pisiform
what structure forms the floor of the carpal tunnel?
palmar ulnocarpal & radiocarpal ligaments
describe the contents of the carpal tunnel
- 4 tendons of flexor digitorum superficialis
- 4 tendons flexor digitorum profundus
- flexor pollicis longus
- flexor carpi radialis
- median nerve
hamate & capitate are connected by ____
interosseous ligament
describe the contents of canal of Guyon
- flexor carpi ulnaris
- ulnar nerve
- ulnar artery
as the ulnar artery enters the hand, it braches into…
superficial & deep palmar branches of ulnar artery
as the radial artery enters the hand, it branches into…
superficial & deep palmar branches of radial artery
the deep palmar branch of the ulnar artery anastamoses with the ____ forming the ____
deep palmar branch of radial artery
deep palmar arch
the deep palmar arch is mostly supplied by the ____ artery
radial
the superficial palmar arch branches into…
- 3 common palmar digital aa
- 1 proper digital a (5th digit)
common palmar digital arteries branch into ____
proper palmar digital arteries
the superficial palmar arch anastamoses with the ____
superficial palmar branch of radial artery
the deep palmar arch branches into…
- 1 princeps pollicis artery
- 3 palmar metacarpal arteries
describe the median nerve as it travels deep to the palmar aponeurosis
- median n
- common palmar digital nn & recurrent branches of median n
- proper palmar digital nn
as the ulnar nerve enters the wrist deep to the palmar aponeurosis, it branches into…
deep & superficial branches ulnar n
superficial branch of ulnar nerve branches into…
- 1 proper palmar digital n
- 1 common palmar digital n -> proper
name the muscles innervated by branches of the median n
- abductor pollicis brevis
- flexor pollicis brevis
- opponens pollicis
- 1st & 2nd lumbricals
origin & insertion of abductor pollicis brevis
O: flexor retinaculum & tubercle of trapezium
I: base of proximal phalynx of thumb
innervation of abductor pollicis brevis
recurrent branches of median n (c8, T1)
action of abductor pollicis brevis
abduct the thumb
origin & insertion of flexor pollicis brevis
O: deep - trapezoid & capitate
superficial - flexor retinaculum & tubercle of trapezium
I: base of proximal phalynx of thumb
innervation of flexor pollicis brevis
recurrent branch of median n (C8, T1)
action of flexor pollicis brevis
flexes carpometacarpal & metacarpophalangeal joint of thumb
origin & insertion of opponens pollicis
O: flexor retinaculum, scaphoid, trapezium
I: entire length of lateral border of metacarpal bone
innervation of opponens pollicis
recurrent branches of median n (C8, T1) (sometimes deep branch of ulnar n)
action of opponens pollicis
opposes thumb to other fingers
origin & insertion of abductor digiti minimi
O: pisiform & tendon of flexor carpi ulnaris
I: base of proximal phalynx of 5th digit
innervation of abductor digiti minimi
deep branch of ulnar n (C8, T1)
action of abductor digiti minimi
abducts 5th digit
origin & insertion of flexor digiti minimi
O: hamulus of hamate & flexor retinaculum
I: base of proximal phalynx of 5th digit
innervation of flexor digiti minimi
deep branch of ulnar n (C8, T1)
action of flexor digiti minimi
flexes 5th digit
origin & insertion of opponens digiti minimi
O: hamulus of hamate & flexor retinaculum
I: ulnar side of 5th metacarpal
innervation of opponens digiti minimi
deep branch ulnar n (C8, T1)
action of opponens digiti minimi
opposes 5th digit to thumb
origin & insertion of lumbricals
O: 4 tendons of flexor digitorum profundus
I: radial side of dorsal digital expansion of 2nd-5th digits
innervation of lumbricals
radial/1st & 2nd: median n
ulnar/3rd & 4th: deep branch of ulnar n
(C8, T1)
action of lumbricals
- flex metacarpophalangeal jts (make an ‘L’)
- extend interphalangeal jts (when flexed)
origin & insertion of adductor pollicis
O: oblique - capitate & bases of 2nd & 3rd metacarpal bones
transverse - palmar surface of 3rd metacarpals
I: ulnar side of base of proximal phalynx of thumb
innervation of adductor pollicis
deep branch of ulnar nerve (C8, T1)
action of adductor pollicis
adduct thumb
origin & insertion of palmar interossei
O: 1st - ulnar side of 2nd metacarpal
2nd & 3rd - radial side of 4th & 5th metacarpals
I: 1st - ulnar side of base of 2nd proximal phalynx
2nd & 3rd - radial side of base of 4th & 5th proximal phalanges
innervation of palmar interossei
deep branch of ulnar n (C8, T1)
action of palmar interossei
adduct digits 5, 4, 2
assist lumbricals
(‘3PAD’)
origin & insertion of dorsal interossei
O: arise by 2 heads from adjacent sides of metacarpals
I: 1st & 2nd - radial side of bases of 2nd & 3rd proximal phalanges & dorsal digital expansion
3rd & 4th: ulnar side of bases of 3rd & 4th proximal phalanges & dorsal digital expansion
innervation of dorsal interossei
deep branch of ulnar nerve (C8, T1)
action of dorsal interossei
abduct medial 4 digits & assist lumbricals
(‘4DAB’)
