CNS.PNS.

Question 1

What are the 2 parts to the CNS

Answer 1

1. Brain

2. Spinal Cord

Question 2

Name the parts of the PNS

Answer 2

1. Somatic

2. Autonomic (Parasympatthetic/Sympathetic)

Question 3

Define the Axon Hillock (AH)

Answer 3

(AH) - the final site where membrane potentials propagated from synaptic inputs summated before being transmitted to the axon. (Where the cell body and axon meet)

Question 4

What are dendrites?

Answer 4

Dendrites are the principal signal reception and processing sites on neurons

Question 5

Define an Axon

Answer 5

Axons conduct action potentials from cell body to synaptic terminal. Allow for RAPID communication

Question 6

Name the 4 types of CNS Glial Cells

Answer 6

1. Astrocytes (Most abundant)
2. Ependymal
3. Microglia
4. Oligodendrocytes

Question 7

Define an astrocyte

Answer 7

MOst abundant glial cell in CNS, Star chaped, uptake of transmitters and K+

Question 8

Define a Microglia

Answer 8

Rare, but common in injury sites/neurodegredation

Question 9

Define an Ependymal cell

Answer 9

Line the ventricles of the cerebrum.

Question 10

Define an Oligodendrocyte

Answer 10

Provide the myelin sheath in the CNS, allows for rapid transmission

Question 11

What are the Glial cells in the PNS

Answer 11

Schwann cells, surround PNS

Question 12

Grey vs white matter

Answer 12

Grey: cell bodies
White: Axons