Neurones

Question 1

Name 4 types of glia that are present in the CNS

Answer 1

Astrocytes
Oligodendrocytes
Ependyma
Microglia

Question 2

Name 3 types of glia that are present in the PNS

Answer 2

Schwann cells
Satellite cells
Microglia

Question 3

Describe the structure of a cell body

Answer 3

Contain the nucleus
Nissl substance present- for protein synthesis
May be dendrites

Question 4

What is meant by ‘myelinated’?

Answer 4

An axon is insulated by a myelin sheath made up of Schwann cells

Question 5

What are the sections between myelin sheaths called on an axon?

Answer 5

Nodes of Ranvier

Question 6

Why can a myelinated with a diameter greater than 1um conduct faster than an unmyelinated axon of the same size?

Answer 6

The myelin sheath acts as an insulator. Impulses can ‘jump’ between Nodes of Ranvier (saltatory conduction)

Question 7

What is Wallerian degeneration?

Answer 7

Removal of a damaged nerve by phagocytosis

Question 8

What are glia?

Answer 8

Cells which ‘glue’ the nervous system together