Wrist, Hand, & Joints Flashcards

1
Q

what does the ulnar nerve innervate?

A

hypothenar muscles
3rd and 4th lumbricals
PAD
DAB

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2
Q

what does the deep branch of ulnar n. innervate?

A
adductor pollicis (transverse and oblique heads)
deep portion of flexor pollicis brevis
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3
Q

what does the recurrent branch of median nerve innervate?

A

thenar muscles

1st and 2nd lumbricals

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4
Q

what does the superficial ulnar n. innervate?

A

palmaris brevis m.

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5
Q

where is the median nerve located?

what nerve is easily injured and superficially located?

A

deep to the palmar aponeurosis

recurrent branch of median n.

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6
Q

what is the origin of the superficial palmar arch?

what does the arch continue as?

A

ulnar a.

common digital a. then proper palmar digital a.

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7
Q

what is the primary source of the deep palmar arch?

what does the primary source continue as?

A

radial a.

princeps pollicus a. then radialis indicis a.

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8
Q

what makes up the thenar eminence from lateral to medial (anatomical position)

A

Abductor pollicis brevis
Flexor pollicis brevis (sup. and deep heads)
Opponens pollicis

Adductor pollicis (transverse and oblique heads) –> NOT PART OF THENAR EMINENCE

ALL FOR ONE AND

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9
Q

what makes up the hypothenar eminence lateral to medial?

A

Opponens digiti minimi
Flexor digiti minimi
Abductor digiti minimi

ONE FOR ALL

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10
Q

what is the innervation of thenar muscles?

blood supply?

A

recurrent branch of median n. (C8, T1)

radial a.

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11
Q

opponens pollicis action

A

oppose and medially rotate thumb

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12
Q

abductor pollicis brevis action

A

abduct thumb, aids opposition

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13
Q

flexor pollicis brevis action

innervations of deep head?

A

flex thumb

deep branch ulnar n.

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14
Q

adductor pollicis action

innervation

A

adduct thumb to lateral border

deep branch ulnar n.

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15
Q

hypothenar m. innervation

blood supply?

A

ulnar n. (C8, T1)

ulnar a.

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16
Q

Opponens digiti minimi action

A

bring 5th metacarpal ant. and rotates it to oppose thumb

17
Q

flexor digiti minimi action

A

flex prox phalanx of 5th digit

18
Q

abductor digiti minimi action

A

abduct 5th digit, flex prox phalanx

19
Q

where are the 1st and 2nd lumbricals attached?

innervation?

blood supply

A

lateral 2 tendons of FDP

median n.

radialis indices and superficial palmar arch

20
Q

where do the 3rd and 4th lumbricals attach?

innervation?

blood?

action?

A

medial 3 tendons of FDP

deep branch ulnar n.

sup. palmar arch and dorsal carpal arch

flex MCP joints, extend IP joints of digits 2-5

21
Q

PADS action?

how many?

A

adduct digits 2,4,5

3

22
Q

DABS action

how many

A

abduct 2,3,4 and assist lumbricals

4

23
Q

innervation of PAD and DAB?

24
Q

shortening and thickening of palmar fascia that pulls the 4th and 5th digits into partial flexion is what?

A

Dupuytren’s Contracture

hereditary

25
what is tensosynovitis? what causes it?
inflammation of tendon and synovial sheat infections in digital synovial sheath
26
what is special about 5th digit tensosynovitis?
infection can spread into carpal tunnel and forearm, bc sheath continuous with ulnar bursa
27
what is the wrist joint called? what is the articulation bw?
radiocarpal joint radius bw scaphoid and lunate
28
what is the joint called bw prox carpal row and distal carpal row?
midcarpal joint
29
extension of the wrist joint involves what joints and %'s?
67% radiocarpal | 33% midcarpal
30
flexion of the wrist joint involves what joints and %'s?
60% midcarpal 40% radiocarpal
31
what injury is common when extended? flexed?
FOOSH carpal fracture
32
degrees of abduction? adduction?
15-25 30-45
33
what ligaments support the radiocarpal joint?
radial collateral ulnar collateral palmar radiocarpal palmar radioulnar
34
what muscles are responsible for the power grip?
flexor digitorum profundus flexor pollicus longus