MSK 4

Question 1

How many bones form the wrist

Answer 1

8 carpal bones

Question 2

What are these bones

Answer 2

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

Question 3

What is the base of the thumb called

Answer 3

The thenar eminence

Question 4

What is the blood supply of the hand?

Answer 4

Ulna artery

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

Question 5

What are the names of the two arches present here

Answer 5

1. ) The superficial palmer arch

2. ) The deep palmer arch

Question 6

What are the lumbricals

Answer 6

Small muscles in hand that are attached to the flexor tendons

Question 7

Two tendons in the fingers

Answer 7

1. ) Flexor digitorum superficialis

2. ) Flexor digitorum profundus

Question 8

Name of the membrane that surrounds the tendons

Answer 8

Synovial membrane

Question 9

Role of the synovial membrane

Answer 9

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

Question 10

What is the retinaculum

Answer 10

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

Question 11

Role of the retinaculum

Answer 11

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

Question 12

The superficial tendon

Answer 12

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

Question 13

Role of the middle phalanx muscle

Answer 13

• Will contract (flex) the proximal interphalangeal joint

Question 14

The deep tendon

Answer 14

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

Question 15

What are the connections between the two tendons

Answer 15

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

Question 16

Details on the lumbrical muscle to the index finger

Answer 16

• Origin: the profunda tendon

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

Question 17

What is the action of the abductor pollicis brevis

Answer 17

Pull the thumb away from the palm of the hand

Question 18

What is the action of the abductor pollicis brevis muscle

Answer 18

Pull the thumb away from the palm of the hand

Question 19

What is the action of the flexor pollicis brevis muscle

Answer 19

Is attached to the proximal phalanx and will flex this joint

Question 20

What is the action of opponens pollicis muscle

Answer 20

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

Question 21

What are the action of the adductor pollicis muscles

Answer 21

Pull the thumb towards the palm of the hand

Question 22

What is the action of the abductor digiti minimi

Answer 22

Pulls the little finger away from the ring finger

Question 23

What is the action of the flexor digiti minimi

Answer 23

Will flex the metacarpophalangeal joint

Question 24

What is the action of opponens digiti minimi

Answer 24

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

Question 25

What is the action of the dorsal interosseous muscles

Answer 25

Will pull the index finger away from the middle finger

Question 26

How many dorsal interosseous muscles are there?

Answer 26

4 (one in each of the 4 web spaces)

Question 27

Role of them

Answer 27

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

Question 28

How many interrossi are there on the PALM of the hand

Answer 28

3

Question 29

Role of the interrossi on the PALM of the hand

Answer 29

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

Question 30

Pneumonic for muscles of the hand

Answer 30

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

Question 31

Nerve supply of the hand

Answer 31

LLOAF: supplied by the median nerve | Dorsal/palmer interrossi (+ some others): supplied by ulna nerve