12 - PNS and Motor System: the Motor Unit Flashcards Preview

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Flashcards in 12 - PNS and Motor System: the Motor Unit Deck (15):
1

What levels give off a white communicating ramus to a sympathetic trunk ganglion?

Thoracic and upper lumbar

2

Arm supplied dermatomes

C5-T1

3

Trunk supplied dermatomes

T dermatomes

4

Nipple line supplied dermatome

T4/T5

5

Umbilicus supplied dermatome

T10

6

Leg supplied dermatomes

L1-S2

7

Saddle supplied dermatomes

S2-S5

8

Perianal region supplied dermatomes

S3-S5

9

Upper extremity myotomes

C5-T1

10

Lower extremity myotomes

L1/L2-S2

11

Describe the pathway of the somatic motor fiber

Ventral horn -> ventral root

12

Describe the pathway of sympathetic visceral motor fibers

(From T1-L3) Lateral horn cell -> ventral root -> spinal nerve -> white communicating ramus -> symp. paravertebral ganglion -> grey communicating ramus -> w/ somatic efferent fibers

13

Describe the pathway of parasympathetic visceral motor fibers

(From S2-S4) Ventral root -> pelvic nerves (should be similar to symp. visc. motor fibers)

14

Describe the pathway of somatic and visceral sensory fibers

Enter by dorsal root -> DRG

15

From the outside inwards, name the parts of a peripheral nerve fiber

Epineurium > perineurium > fascicles > endoneurium > Schwann cells > nerve