Neuroanatomy Lab I

Question 1

Within the fascicle, there are dark, flattened nuclei between the axons. What layer of connective tissue sheath are they producing?
perineurium
Within the fascicle, there are dark, flattened nuclei between the axons. What layer of connective tissue sheath are they producing?

Answer 1

perineurium

Question 2

Which modality might the small diameter axons be transmitting?

Answer 2

Pain, temperature, itch

Question 3

How many axons can a single Schwann cell in sheathe with myelin?

Answer 3

1:1 ratio

Question 4

How many unmyelinated axons can be embedded in a single Schwann cell?

Answer 4

1 and many

Question 5

What type of cell forms CNS myelin?

Answer 5

Oligodendricytes

Question 6

As the successive myelin lamellae terminate in pockets of paranodal cytoplasm, they leave a portion of the axon with no insulating myelin sheath. This arrangement creates what form of nerve conduction?

Answer 6

Salutatory conduction

Question 7

Where are voltage-gated ion transporters located?

Answer 7

Sodium voltage-gated ion transporters around the node of ranvier

Question 8

What happens to signal conduction if the myelin sheath is destroyed?

Answer 8

Slower; multiple sclerosis in CNS and Guillain-Barre in PNS