W1

Question 1

How many cells are in the brain?

Answer 1

80 billion neurons

10 glia cells per neuron

Question 2

What cell is this?

Answer 2

Neurons in mesencephalic nucleus of cranial nerve V

Question 3

Answer 3

Retinal ganglion cell

Question 4

Answer 4

retinal amacrine cell

Question 5

Answer 5

cortical pyramid cell

Question 6

Answer 6

Astrocyte -

• keep neurons healthy trough trophish processes
• take up an recycle glutamate from synapses
• are involved in sense perception
• importan for the blood/brain barrier

Question 7

Answer 7

oligodendrocyte

myelin coating of axons in CNS

Question 8

Answer 8

Microgoglial- work as phagocytosis

Question 9

Schwann cells

Answer 9

builds myelin coats in peripheral nervous system

Question 10

What are the hills and valleys of the cortex called?

Answer 10

Hills: Gyri

Valleys: Sulci

Question 11

methods of investigation the structures of the nervous system.

Answer 11

Dissection

Golgi staining

• 1 in 1000 cells stained
• processes also stained
• can see how nervous system is made up of single cells

axonal tracing

fluorescent dyes

genetic marking

Problems: to understand properly, need to look at living working brain.

Question 12

What are the principals of brain organisation?

Answer 12

Neurons are organised in 6 layers in the cortex

Neurons are organised in bundles (ganglia)