Wrist and Palm

Question 1

surface anatomy

what is the crease at the base of the fingers called?

Answer 1

interdigital fold

Question 2

surface anatomy

What are the 2 areas at the base of the palm called?

Answer 2

hypothenar eminence
thenar eminence

Question 3

name the carpal bones

Answer 3

scaphoid
lunate
triquetrum
pisiform
trapezium
trapezoid
capitate
hamate

“Some Lovers Try Positions That They Can’t Handle”

Question 4

Describe the cutaneous innervation of the palm by the ulnar nerve

Answer 4

5th digit & 1/2 of 4th digit

(tea fingers)

Question 5

Describe the cutaneous innervation of the palm by the median nerve

Answer 5

1st, 2nd, 3rd digits, 1/2 of 4th digit

(tea fingers)

Question 6

Describe the cutaneous innervation of the palm by the radial nerve

Answer 6

superficial branch of radial n innervates small area of proximal thenar eminence area

Question 7

C8 dermatome of the palm

Answer 7

4th & 5th digits

Question 8

C7 dermatome of the palm

Answer 8

3rd (middle) digit

Question 9

C6 dermatome of the palm

Answer 9

1st & 2nd digits

Question 10

how do palmar branches of the ulnar & median nerves travel in the wrist?

Answer 10

do not pass under flexor retinaculum or through carpal tunnel

Question 11

describe the cutaneous innervation of the palm by the lateral antebrachial cutaneous nerve

Answer 11

lateral/radial aspect of wrist

Question 12

cutaneous innervation of the palm

palmar branches of the median and ulnar nerves supply cutaneous innervation to…

Answer 12

base of palm (ulnar side and medial palm)

Question 13

origin of palmaris brevis

Answer 13

palmar aponeurosis & flexor retinaculum

Question 14

insertion of palmaris brevis

Answer 14

skin of ulnar side of palm

Question 15

innervation of palmaris brevis

Answer 15

superficial branch of ulnar nerve

Question 16

action of palmaris brevis

Answer 16

wrinkles & tenses skin over hypothenar eminance

Question 17

where does flexor retinaculum attach medially?

Answer 17

hook of hamate & pisiform

Question 18

where does flexor retinaculum attach laterally?

Answer 18

scaphoid & trapezium

Question 19

what structure forms the roof of the carpal tunnel?

Answer 19

flexor retinaculum

Question 20

what structure forms the lateral border of the carpal tunnel?

Answer 20

tubercles of scaphoid & trapezium

Question 21

what structure forms the medial border of the carpal tunnel?

Answer 21

hook of hamate & pisiform

Question 22

what structure forms the floor of the carpal tunnel?

Answer 22

palmar ulnocarpal & radiocarpal ligaments

Question 23

describe the contents of the carpal tunnel

Answer 23

• 4 tendons of flexor digitorum superficialis
• 4 tendons flexor digitorum profundus
• flexor pollicis longus
• flexor carpi radialis
• median nerve

Question 24

hamate & capitate are connected by ____

Answer 24

interosseous ligament

Question 25

describe the contents of canal of Guyon

Answer 25

- flexor carpi ulnaris - ulnar nerve - ulnar artery

Question 26

as the ulnar artery enters the hand, it braches into...

Answer 26

superficial & deep palmar branches of ulnar artery

Question 27

as the radial artery enters the hand, it branches into...

Answer 27

superficial & deep palmar branches of radial artery

Question 28

the deep palmar branch of the ulnar artery anastamoses with the ____ forming the ____

Answer 28

deep palmar branch of radial artery deep palmar arch

Question 29

the deep palmar arch is mostly supplied by the ____ artery

Answer 29

radial

Question 30

the superficial palmar arch branches into...

Answer 30

- 3 common palmar digital aa - 1 proper digital a (5th digit)

Question 31

common palmar digital arteries branch into ____

Answer 31

proper palmar digital arteries

Question 32

the superficial palmar arch anastamoses with the ____

Answer 32

superficial palmar branch of radial artery

Question 33

the deep palmar arch branches into...

Answer 33

- 1 princeps pollicis artery - 3 palmar metacarpal arteries

Question 34

describe the median nerve as it travels deep to the palmar aponeurosis

Answer 34

- median n - common palmar digital nn & recurrent branches of median n - proper palmar digital nn

Question 35

as the ulnar nerve enters the wrist deep to the palmar aponeurosis, it branches into...

Answer 35

deep & superficial branches ulnar n

Question 36

superficial branch of ulnar nerve branches into...

Answer 36

- 1 proper palmar digital n - 1 common palmar digital n -> proper

Question 37

name the muscles innervated by branches of the median n

Answer 37

- abductor pollicis brevis - flexor pollicis brevis - opponens pollicis - 1st & 2nd lumbricals

Question 38

origin & insertion of abductor pollicis brevis

Answer 38

O: flexor retinaculum & tubercle of trapezium I: base of proximal phalynx of thumb

Question 39

innervation of abductor pollicis brevis

Answer 39

recurrent branches of median n (c8, T1)

Question 40

action of abductor pollicis brevis

Answer 40

abduct the thumb

Question 41

origin & insertion of flexor pollicis brevis

Answer 41

O: deep - trapezoid & capitate superficial - flexor retinaculum & tubercle of trapezium I: base of proximal phalynx of thumb

Question 42

innervation of flexor pollicis brevis

Answer 42

recurrent branch of median n (C8, T1)

Question 43

action of flexor pollicis brevis

Answer 43

flexes carpometacarpal & metacarpophalangeal joint of thumb

Question 44

origin & insertion of opponens pollicis

Answer 44

O: flexor retinaculum, scaphoid, trapezium I: entire length of lateral border of metacarpal bone

Question 45

innervation of opponens pollicis

Answer 45

recurrent branches of median n (C8, T1) (sometimes deep branch of ulnar n)

Question 46

action of opponens pollicis

Answer 46

opposes thumb to other fingers

Question 47

origin & insertion of abductor digiti minimi

Answer 47

O: pisiform & tendon of flexor carpi ulnaris I: base of proximal phalynx of 5th digit

Question 48

innervation of abductor digiti minimi

Answer 48

deep branch of ulnar n (C8, T1)

Question 49

action of abductor digiti minimi

Answer 49

abducts 5th digit

Question 50

origin & insertion of flexor digiti minimi

Answer 50

O: hamulus of hamate & flexor retinaculum I: base of proximal phalynx of 5th digit

Question 51

innervation of flexor digiti minimi

Answer 51

deep branch of ulnar n (C8, T1)

Question 52

action of flexor digiti minimi

Answer 52

flexes 5th digit

Question 53

origin & insertion of opponens digiti minimi

Answer 53

O: hamulus of hamate & flexor retinaculum I: ulnar side of 5th metacarpal

Question 54

innervation of opponens digiti minimi

Answer 54

deep branch ulnar n (C8, T1)

Question 55

action of opponens digiti minimi

Answer 55

opposes 5th digit to thumb

Question 56

origin & insertion of lumbricals

Answer 56

O: 4 tendons of flexor digitorum profundus I: radial side of dorsal digital expansion of 2nd-5th digits

Question 57

innervation of lumbricals

Answer 57

radial/1st & 2nd: median n ulnar/3rd & 4th: deep branch of ulnar n (C8, T1)

Question 58

action of lumbricals

Answer 58

- flex metacarpophalangeal jts (make an 'L') - extend interphalangeal jts (when flexed)

Question 59

origin & insertion of adductor pollicis

Answer 59

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

Question 60

innervation of adductor pollicis

Answer 60

deep branch of ulnar nerve (C8, T1)

Question 61

action of adductor pollicis

Answer 61

adduct thumb

Question 62

origin & insertion of palmar interossei

Answer 62

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

Question 63

innervation of palmar interossei

Answer 63

deep branch of ulnar n (C8, T1)

Question 64

action of palmar interossei

Answer 64

adduct digits 5, 4, 2 assist lumbricals ('3PAD')

Question 65

origin & insertion of dorsal interossei

Answer 65

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

Question 66

innervation of dorsal interossei

Answer 66

deep branch of ulnar nerve (C8, T1)

Question 67

action of dorsal interossei

Answer 67

abduct medial 4 digits & assist lumbricals ('4DAB')