Muscles of the Hand Flashcards

1
Q

How many total hand muscles are there?

A

20

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2
Q

How many are innervated by the median n.?

A

5

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3
Q

How many are innervated by the ulnar n.?

A

15

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4
Q

What are the muscles of the thenar eminence?

A

Abductor pollicis brevis, flexor pollicis brevis, opponens pollicis mm.

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5
Q

What nerve innervates the muscles of the thenar eminence?

A

Median nerve

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6
Q

What are the muscles of the hypothenar eminence?

A

Abductor digiti minimi, flexor digiti minimi, opponens digiti minimi mm.

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7
Q

What nerve innervates the hypothenar eminence muscles?

A

Ulnar n.

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8
Q

What nerve innervates lumbricals 1 and 2?

A

Median nerve

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9
Q

What nerve innervates lumbricals 3 and 4?

A

Ulnar nerve

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10
Q

What are the actions of the lumbricals?

A

Flex at the metacarpophalangeal joints, extend at the interphalangeal joints.

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11
Q

What are the only muscles innervated by the median nerve in the hand?

A

Lumbricals 1 and 2, thenar eminence muscles

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12
Q

A- Adductor pollicis

A

Adduction of the thumb

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13
Q

Inn- Adductor pollicis

A

ulnar nerve

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14
Q

A- Palmar interosseus muscles

A

Adduction of the digits (PAD)

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15
Q

A- Dorsal interosseous muscles

A

Abduction of the digits (DAB)

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16
Q

What is the only hand muscle that would be tagged on a practical?

A

First dorsal interosseous muscle

17
Q

A- Palmaris brevis

A

None, protects the neurovasculature in the hand