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Semester 2 - MSK > Week 6 - Intrinsic Muscles of the Hand > Flashcards

Week 6 - Intrinsic Muscles of the Hand Flashcards

1
Q

Where are the thenar muscles located?

A

At the base of the thumb, on the palmar side.

Produce “fleshy lump”

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2
Q

What muscles make up the thenar group?

A

Adductor pollicis brevis
Opponens pollicis
Flexor pollicis brevis

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3
Q

What nerve innervates the thenar muscles (include nerve roots)

A

The median nerve, C5 - T1

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4
Q

What is the action of opponens pollicis?

A

Opposes the thumb by flexing and medially rotating the metacarpal on the trapezium

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5
Q

What is the action of abductor pollicis brevis?

A

Abducts the thumb

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6
Q

What is the action of flexor pollicis brevis?

A

Flexes the MCP joint of the thumb

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7
Q

Where is the hypothenar eminence? What muscles form this?

A 
Fleshy lump on the ulnar side of the palm.
Formed by:
Opponens digiti minimi
Flexor digiti minimi brevis
Abductor digiti minimi
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8
Q

What nerve innervates the hypothenar muscles?

A

The ulnar nerve (C8/T1)

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9
Q

What is the action of flexor digiti minimi brevis?

A

Flexes the little finger at the MCP joint

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10
Q

What is the action of abductor digiti minimi?

A

Abducts the little finger

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11
Q

What is the action of opponens digiti minimi?

A

Opposes the little finger by rotating the metacarpal towards the thumb side of the palm.

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12
Q

How many lumbricals are there?

A

4 - 1 for each finger

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13
Q

What is the function of the lumbricals?

A

Link the flexor and extensor tendons - flex at MCP and extend at IP

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14
Q

What is the innervation of the lumbricals?

A

Lateral 2 = median nerve

Medial 2 = ulnar nerve

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15
Q

Where are the interossei located?

A

Between the metacarpals

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16
Q

What nerve innervates all the interossei muscles?

A

The ulnar nerve

17
Q

How many dorsal interossei are there?

A

4

18
Q

What is the function of the dorsal interossei?

A

Abduct the fingers at the MCP joints

19
Q

How many palmar interossei are there?

A

3 - 2nd, 4th and 5th digits

20
Q

What is the action of the palmar interossei?

A

Adduct the fingers

21
Q

What are the 2 “miscellaneous” intrinsic muscles of the hand?
Are they located on the palmar or dorsal side?

A

Adductor pollicis
Palmaris brevis

Palmar side

22
Q

What nerve innervates adductor pollicis?

A

Ulnar nerve

23
Q

Is palmaris brevis innervated by the median nerve?

A

No - ulnar nerve

24
Q

What is the action of adductor pollicis? (You’ll never guess!)

A

Adducts the thumb

25
Q

Why is adductor pollicis an anatomical landmark?

A

2 heads, between which the radial artery passes

26
Q

What is the action of palmaris brevis?

A

Wrinkles the skin of the hypothenar eminence
Deepens the curvature of the skin
Both these improve grip

27
Q

What are the 5 groups of intrinsic muscles of the hand?

A 
Thenar
Hypothenar
Lumbricals
Interossei
Miscellaneous

Semester 2 - MSK (35 decks)

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