Dermatomes and Myotomes Flashcards Preview

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Flashcards in Dermatomes and Myotomes Deck (7)
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1
Q

Define dermatome

A

A patch of skin innervated by a single spinal nerve.

2
Q

Describe how a dermatome is formed.

A

As a limb bud increases in size, nerves are dragged along with the structures that they innervate.

3
Q

Give the segmental innervation of the following upper limb movements:

  • Shoulder abduction
  • Elbow flexion
  • Elbox extention
  • Finger flexion
  • Finger ad/abduction
A
C5
C6
C7
C8
T1
4
Q

Give the segmental innervation of the following lower limb movements:

  • Flexion at the hip
  • Knee flexion
  • Knee extention
  • Plantar flexion
  • Adduction of the toes
A
L1/2
L5 to S2
L3/4
S1/2
S2/3
5
Q

Define myotome

A

All muscles innervated by a single spinal nerve

6
Q

Define motor unit

A

All muscle fibres innervated by a single motor nerve fibre.

7
Q

Describe the difference in loss of sensation when lesions are close to the spinal cord instead of more distal.

A

Close - loss of sensation in the dermatomes

Distal - loss of sensation in the peripheral nerve field.