ToB - neurones, nerve fibres and peripheral nerves & ANS Flashcards Preview

Exam 1 > ToB - neurones, nerve fibres and peripheral nerves & ANS > Flashcards

Flashcards in ToB - neurones, nerve fibres and peripheral nerves & ANS Deck (12):
1

what does bipolar neurone look like?

has neurones on either side of nucleus body (balanced)
smell, sight, balance

2

unipolar neuron?

sensory neurone
sticks out from line of dendrites

3

multipolar (motoneurone)

reach out from the cell body (after axon hillock and nissyl substance)
main neurone in motor and intermediate neurones

4

how do myelinated neurones function differently?

myelinated neurones have a myelin sheath and use salutatory conduction so that nerve impulse travels faster
cell membrane of schwann cell contains myelin (wrap around axon)
high concentration of Na+ in the nodes of ranvier whilst other ion concentrations are spread out

5

what are the glial cells in the CNS?

astrocytes
oligodendrocytes
microglial
ependyma

6

what is the function of astrocytes in the CNS?

mediate metabolic exchange at neurones: nutrient & waste products between nerve & blood

7

what is the function of oligodendrocytes in the CNS?

provide myelination for multiple neurones at once

8

what is the function of microglial cells in the CNS?

immune

9

what is the function of ependyma cells in the CNS?

ciliated, pump spinal fluid (CSF)
line ventricles & central canal of spinal cord

10

what is the ganglion?

lots of cell bodies
where the pre ganglionic and post ganglionic nerve fibres meet

11

what blocks the muscarinic ACh receptor?

atropine

12

what stimulates AChR?

nicotine