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MSK > 4. Muscles Of The Hand > Flashcards

4. Muscles Of The Hand Flashcards

1
Q

Which nerve innervates the thenar muscles?

A

Median nerve

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2
Q

How many thenar muscles are there?

A

3

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3
Q

What does the belly of the thenar muscles form?

A

Thenar eminence

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4
Q

Name the 3 thenar muscles.

A
  1. Opponens pollicis
  2. Abductor pollicus brevis
  3. Flexor pollicis brevis
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5
Q

Which nerve innervates the hypothenar muscles?

A

Ulnar nerve

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6
Q

Which nerve innervates the interossei muscles?

A

Ulnar nerve

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7
Q

What is the clinical sign of a scaphoid fracture?

A

Tenderness in anatomical snuffbox

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8
Q

Which part of the scaphoid is at risk of necrosis after a scaphoid fracture?

A

Proximal part

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9
Q

How many dorsal interossei muscles are there?

A

4

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10
Q

What is the action of the dorsal interossei muscles?

A

Abduction of the fingers at the MCP joint

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11
Q

How many palmer interossei muscles are there?

A

3

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12
Q

What is the action of the palmer interossei muscles?

A

Adduction of the fingers at the MCP joint

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13
Q

How many lumbricals are there?

A

4

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14
Q

What are the contents of the anatomical snuffbox?

A

Radial artery
Radial nerve
Cephalic vein

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15
Q

Which nerve passes through the carpal tunnel?

A

Median nerve

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16
Q

What is the clinical significance of the carpal tunnel?

A

Compression of the median nerve within the carpal tunnel can cause carpal tunnel sydrome.

17
Q

What is the lateral border of the carpal tunnel?

A

Scaphoid and trapezium tubercles

18
Q

What is the medial border of the carpal tunnel?

A

Hook of hamate and pisiform

19
Q

What forms the roof of the carpal tunnel?

A

Flexor retinaculum

20
Q

What is the medial border of the anatomical snuff box?

A

Extensor pollicus longus

21
Q

What is the lateral border of the anatomical snuff box?

A

Extensor pollicus brevis and abductor pollicus longus tendons

22
Q

What forms the floor of the anatomical snuff box?

A

Carpal bones - scaphoid and trapezium

23
Q

What is the proximal border of the anatomical snuff box?

A

Styloid process of the radius

MSK (16 decks)

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