CNS

Question 1

What is the central nervous system (CNS)?

Answer 1

The CNS is composed of the brain and the spinal cord

Question 2

glial cell types within the CNS

Answer 2

oligodendrocytes, astrocytes, microglia and ependyma

Question 3

oligodendrocytes

Answer 3

myelinating cells within the CNS. Have multiple processes so one can myelinated multiple axons

Question 4

astrocytes

Answer 4

support and monitor the neurone cells. In the white matter there are more fibrous astrocytes and in grey matter there are more protoplasmic astrocytes

Question 5

what type of cells cause scarring in the CNS?

Answer 5

astrocytes

Question 6

microglial cells

Answer 6

modified macrophage cells of the CNS that mostly lie inactive but can phagocytose dying neurons

Question 7

schwann cells

Answer 7

myelinating cells of the PNS. only one cell can myelinate one axon.

Question 8

ependyma

Answer 8

specialised type of epithelium lining the myelin sheath. produces cerebrospinal fluid.

Question 9

what are mixed nerves?

Answer 9

mixed nerves carry both sensory and motor axons. these are bundles of nerves surrounded by fibres (mainly collagen)

Question 10

Endoneurium (as part of a mixed nerve)

Answer 10

very fine fibres surrounding individual nerve axons and myelin sheaths

Question 11

perineurium

Answer 11

connective tissue fibres that bind multiple neutron axons into a fascicle

Question 12

epineurium

Answer 12

loose connective tissue that surrounds the entire nerve and carries blood vessels inwards to the neurons.