BL S7 The Nervous System

Question 1

Describe the structure of a spinal nerve.

Answer 1

Nerve fibres surrounded in endoneurium.
Many nerve fibres surrounding by perineurium forming a fascicles.
Many fascicles surrounded by epineurium

Question 2

What is the function of astrocytes?

Answer 2

Form part of the BBB

Clear up any NT that diffuses away from synapses.

Question 3

Difference between Schwann cells and oligodendrocytes?

Answer 3

Schwann cells myelinated one axon in the peripheral nervous system
Oligodendrocytes myelinate multiple axons in the CNS.

Question 4

What is the functions of microglia?

Answer 4

Immune cells of the CNS
Have dendritic processes that detect antigens
If detected they turn into a macrophage.

Question 5

What is the role of a multipolar neurone?

Answer 5

Carry signal from CNS to effectors.

Question 6

What is the role of a bipolar/ pseudounipolar neurone?

Answer 6

Sensory system

Receptor to CNS

Question 7

Why can pseudounipolar neurones conduct faster than bipolar neurones?

Answer 7

Soma present in the middle of bipolar neurones slows down signal propagation.