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Anatomy Sessions > MSK 4 > Flashcards

MSK 4 Flashcards

1
Q

How many bones form the wrist

A

8 carpal bones

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2
Q

What are these bones

A
  1. ) Proximal row Scaphoid and lunate: these articulate w radius
  2. ) Triquetral and pisiform
  3. ) Distal row: trapezium/trapezoid/capitate/hamate
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3
Q

What is the base of the thumb called

A

The thenar eminence

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4
Q

What is the blood supply of the hand?

A

Ulna artery

btw no venous drainage in palm of hand bc venous drainage is on back of hand

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5
Q

What are the names of the two arches present here

A
  1. ) The superficial palmer arch

2. ) The deep palmer arch

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6
Q

What are the lumbricals

A

Small muscles in hand that are attached to the flexor tendons

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7
Q

Two tendons in the fingers

A
  1. ) Flexor digitorum superficialis

2. ) Flexor digitorum profundus

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8
Q

Name of the membrane that surrounds the tendons

A

Synovial membrane

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9
Q

Role of the synovial membrane

A

Produces synovial fluid to let the two tendons (FDS/FDP) to slide

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10
Q

What is the retinaculum

A

Thick layer of fascia at the joint (at each finger)

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11
Q

Role of the retinaculum

A

Stops tendon pulling away from the bones when the joint is bending

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12
Q

The superficial tendon

A
  • Divides into two tendons
  • Passes round the deep tendon
  • Inserts onto the middle phalanx
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13
Q

Role of the middle phalanx muscle

A
  • Will contract (flex) the proximal interphalangeal joint
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14
Q

The deep tendon

A
  • Passes through split
  • Travels down to the distal phalanx
  • Action: bend the distal interphalangeal joint
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15
Q

What are the connections between the two tendons

A

The vincula (how tendons get blood). Also lined with synovium

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16
Q

Details on the lumbrical muscle to the index finger

A
  • Origin: the profunda tendon

- Passes round the lateral side of the index finger to insert

17
Q

What is the action of the abductor pollicis brevis

A

Pull the thumb away from the palm of the hand

18
Q

What is the action of the abductor pollicis brevis muscle

A

Pull the thumb away from the palm of the hand

19
Q

What is the action of the flexor pollicis brevis muscle

A

Is attached to the proximal phalanx and will flex this joint

20
Q

What is the action of opponens pollicis muscle

A

Is attached to the shaft of the metacarpal and down onto the carpus.
- It will rotate the thumb

21
Q

What are the action of the adductor pollicis muscles

A

Pull the thumb towards the palm of the hand

22
Q

What is the action of the abductor digiti minimi

A

Pulls the little finger away from the ring finger

23
Q

What is the action of the flexor digiti minimi

A

Will flex the metacarpophalangeal joint

24
Q

What is the action of opponens digiti minimi

A

Will rotate the metacarpal (so that the little finger faces the thumb)

25
Q

What is the action of the dorsal interosseous muscles

A

Will pull the index finger away from the middle finger

26
Q

How many dorsal interosseous muscles are there?

A

4 (one in each of the 4 web spaces)

27
Q

Role of them

A
  1. ) Pull the index finger away from the middle finger
  2. ) Pull the middle finger away from its neutral position
  3. ) Pull the middle finger away from its neutral position BUT in the opposite direction from no.2
  4. ) Will pull the ring finger away from the middle finger
28
Q

How many interrossi are there on the PALM of the hand

A

3

29
Q

Role of the interrossi on the PALM of the hand

A

1.) Will pull the index finger towards the middle finger

2+3) Will pull the ring finger and the little finger towards the middle finger

30
Q

Pneumonic for muscles of the hand

A 
LLOAF
LL: two lateral lumbricals
O: Opponens pollicis
A: abductor pollicis brevis
F: flexor pollicis brevis
31
Q

Nerve supply of the hand

A

LLOAF: supplied by the median nerve

Dorsal/palmer interrossi (+ some others): supplied by ulna nerve

Anatomy Sessions (9 decks)

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