Intro to NS I + II Flashcards Preview

Physiology & Science: Neuroscience I > Intro to NS I + II > Flashcards

Flashcards in Intro to NS I + II Deck (9)
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1

What does a nerve cell do?

- Generate electrical signals
- Form complex circuits

2

What is a nerve cell made up of?

- Dendrites
- Cell body (nucleus, soma, perikaryon)
- Axon (hillock, terminal)
- Synapse

3

What are protective barriers for the brain/spinal cord?

3 layers of membrane (meninges) + CSF

4

What is the blood-brain barrier?

Semi-permeable membrane separating blood from CSF, allows some cells to go past

5

What are the immune cells of the CNS?

Microglia

6

What are astrocytes?

- Star shaped glial cells
- Create blanket around nerve cells and capillaries - form BBB
- Maintain ECF environment for nerve cells
- Control waste / nutrients / ion content

7

What are the two types of myelinating cells?

Oligodendrocytes = CNS myelin sheath

Neurolemmocytes/Schwann Cells = PNS Myelin sheath

8

How do glial cells form a sheath around each axon?

Wrap around axon and deposit multiple layers of external membrane, membrane is lipid so it's a thick fatty sheath. Impermeable to aqueous substances.

9

What is the difference between white and grey matter?

White matter consists of bundles of myelinated axons linking grey matter regions. Grey matter contains cell bodies and dendrites