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Skin/Musculoskeletal: Anatomy/Dissection > Dermatomes and Myotomes > Flashcards

Dermatomes and Myotomes Flashcards

1
Q

What is a dermatome?

A

a unilateral area of skin innervated by the nerve fibers of a single spinal nerve that originated from a single spinal cord segment.

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2
Q

How many spinal nerves are there? From what areas?

A

There are 31 spinal nerves. 8 from the cervical, 12 from thoracic, 5 from lumbar, 5 from sacrum and 1 coccyygeal.

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3
Q

What sensory spinal nerve innervates the shoulder?

A

C5

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4
Q

What sensory spinal nerve innervates the thumb?

A

C6

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5
Q

What sensory spinal nerve innervates the middle finger?

A

C7

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6
Q

What sensory spinal nerve innervates the pinky?

A

C8

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7
Q

What sensory spinal nerve innervates the nipple?

A

T4

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8
Q

What sensory spinal nerve innervates the ubilicus?

A

T10

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9
Q

What sensory spinal nerve innervates the goin?

A

L1

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10
Q

What sensory spinal nerve innervates the medial foot?

A

L5

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11
Q

What sensory spinal nerve innervates the lateral leg/foot?

A

S1

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12
Q

What sensory spinal nerve innervates the anal area?

A

S2, S3, and S4

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13
Q

What spinal nerve innvervates the myotome of the upper extremity abductors (deltoid, biceps brachii)?

A

C5

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14
Q

What spinal nerve innvervates the myotome of the forearm flexors (biceps brachii, brachioradialis) and forearm pronators?

A

C5-C6

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15
Q

What spinal nerve innvervates the myotome of the forarm extensor (triceps brachii), wrist extensors, and finger extensors?

A

C7

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16
Q

What spinal nerves innvervate the myotome of the intrinsic hand muscles?

A

C8, T1

17
Q

What spinal nerve innvervates the myotome of thigh flexion muscles (iliopsoas)?

A

L2

18
Q

What spinal nerves innvervate the myotome of the leg extensors (quadriceps - for the knee jerk reflex)?

A

L3, L4

19
Q

What spinal nerves innvervate the myotome of the foor dorsiflexors and toe extensors (anterior tibial muscles)?

A

L4, L5

20
Q

What spinal nerves innvervate the myotome of the foot plantar flexors and toe flexors (posterior tibial muscles - achilles tendon reflex)

A

S1, S2

21
Q

What spinal nerve innvervates the myotome of the anal contraction muscles?

A

S2, S3, and S4

Skin/Musculoskeletal: Anatomy/Dissection (12 decks)

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