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ANAT315 post midterm > the intrinsic hand > Flashcards

the intrinsic hand Flashcards

1
Q

the thenar eminence is associated to what part of the hand?

A

thumb

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2
Q

the hypothenar eminence is associated to what part of the hand?

A

the pink

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3
Q

what inserts on the palmar aponeurosis

A

palmaris longus tendon

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4
Q

how can the palmar aponeurosis be described?

A

its deep fascia that covers the palm and is anchored to the skin

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5
Q

what is the function of the palmaris brevis? where is it located?

A

no specific function

its a very thin muscle that stretches out on the hypothenar side

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6
Q

what creates the carpal tunnel?

what is its function?

A

flexor retnaculum

its prevents bowing of the flexors of the forearms

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7
Q

where is the flexor retinaculum located?

A

it stretches from the pisiform and hook of the hamate to the trapezium and scaphoid

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8
Q

what are the contents of the carpal tunnel?

A
  • 4 tendons of FDS
  • 4 tendons of FDP
  • tendon of flexor policis longus
  • median nerve
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9
Q

what causes carpal tunnel syndrome?

A

its is a chronic pressure to the median nerve which can result in numbness and weakness in the hand

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10
Q

what is the roof and floor of the carpal tunnel?

A

roof: flexor retinaculum
floor: carpal bones

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11
Q

what passes through guyon’s canal?

A

the ulnar N. and artery

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12
Q

what muscles can be found in the thenar eminence?

A
  • Abductor Pollicis brevis
  • flexor pollicis brevis
  • opponens pollicis (AFO)
  • adductor policis
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13
Q

what innervates the AFO of the thenar eminence?

A

recurrent branch of the median N.

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14
Q

what is the origin and insertion of the adductor policis?
function
innervation?

A

o: had 2 heads, oblique and transverse head which originate from the base of metacarpals
i: base of the first proximal phalanx (thumb)
fct: adduction of the thumb
innervation: deep ulnar nerve

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15
Q

what muscles compose the hypothenar eminence?

A
  • Abductor digiti minimi
  • flexor digiti minimi brevis
  • opponens digiti minimi
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16
Q

what is the longus associated the the flexor digiti minimi brevis?

A

FDS and FDP tendons which pass through the pinky

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17
Q

what nerve innervates the hypothenar eminence?

A

deep ulnar nerve

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18
Q

what happens to the ulnar N and A. after they pass through the guyon’s canal?

A

they split into a deep and superficial branch

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19
Q

Lumbricals (4)
o
I
f?

A

O: Tendon of FDS
I: lateral aspect of the extensor hood
function: concurrent flexion of the MCP joints and extension of the IP joints

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20
Q

what muscles compose the interosseous deep compartment of the hand?

A
  • palmar interossei (3)

- dorsal interossei (4)

21
Q

what is the fucntion of palmar interossei?

what can be used to remember?

A

adduction and flexion of MCP, extension of IP joints for digits 2, 4, 5

PAD

22
Q

what is the fucntion of dorsal interossei?

what can be used to remember?

A

abduction and flexion of MCP, extension of IP of digits 2, 3 , 4
DAB

23
Q

what nerve is responsible for the sensory innervation of the medial 1.5 digits of the hand

A

the superficial branch of the ulnar N.

24
Q

what nerve is responsible for the motor innervation of the palmaris brevis?

A

superficial branch of the ulnar nerve

25
Q

what happens to the common digital branches once they reach the phalanges?

A

they split into 2 branches per phalanges know as the proper digital branches

26
Q

what nerve is resonsibk=le for the sensory innervation of the 3.5 lateral digits?

A

the digital sensory branches of the median nerve

27
Q

what nerve innervates the thernar eminence laterally (sensory)?

A

the radial nerve

28
Q

what is the branch of the median nerve that does not pass through flexor retinaculum?

A

palmar branch of the median n.

29
Q

what does the median nerve innervate (motor)?

A

the lateral 2 lumbricals and the AFO of the thumb

30
Q

what branch of the median nerve is responsible for motor innervation?

A

the recurrent branch of the median nerve

31
Q

what is the deep ulnar nerve responsible of innervating (motor)

A

-they hypothenar eminence

the medial 2 lumbricals, adductor pollicis and dorsal/palmar interossei

32
Q

what type of innervation is the found in the dorsum of the hand?

A

only sensory innervation

33
Q

what nerve sensorly innervated the DIP of the 3.5 lateral fingers?

A

median N.

34
Q

what does the ulnar N. dorsal branch innervate?

A

the 2,5 medial digits to the wrist except for the DIP of digits 3- half of the fourth

35
Q

what does the radial N. superficial branch innervate on the dorsal side of the hand

A

PIP- to wrist of the 2.5 lateral digits

36
Q

what does the superficial palmar arch arise from?

A

the superficial branch of the ulnar A.

37
Q

how is the superficial palmar arch closed by?

A

laterally it is closed by the superficial branch of the radial nerve

38
Q

what does the deep palmar arch arise from?

A

the radial A.

39
Q

how does the deep palmar arch close off?

A

it is closed off by the deep ulnar A on the medial side of the hand

40
Q

what are some branches that immerge from the radial A?

A

-radial indicis A and prinicpis pollicis digital A

41
Q

how do the radial indicis A and prinicpis pollicis digital A and deep palmar arch travel relative to the thumb?

A

posterior to the thumb

42
Q

what test is used to test the anastamoses between the radial and ulnar A in the hand?

A

the allen’s test

43
Q

briefly what is the allen’s test, and what does positive testing result in

A
  • circulation is cut off and then either the ulnar or radial A is released and should allow for circulation throughout the entire hand within 7 seconds
  • a positive test demonstrates incomplete anastamoses
44
Q

what artery supplies the metacarpals of the hand?

A

dorsal metacarpal A.

45
Q

what anastamoses in the dorsal carpal arch?

A

the radial and ulnar A

46
Q

what arteries supply the digits of the dorsal hand?

A

dorsal digital arteries

47
Q

what myotome is responsible for finger flexion, extension of the thumb?
trick?

A

C7

rock

48
Q

what myotome is resonsible for finger extension?

trick?

A

C8

paper

49
Q

what myotome is responsible for finger ab/adduction?

trick?

A

T1

scissors

ANAT315 post midterm (10 decks)

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