ToB - neurones, nerve fibres and peripheral nerves & ANS Flashcards
what does bipolar neurone look like?
has neurones on either side of nucleus body (balanced)
smell, sight, balance
unipolar neuron?
sensory neurone
sticks out from line of dendrites
multipolar (motoneurone)
reach out from the cell body (after axon hillock and nissyl substance)
main neurone in motor and intermediate neurones
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
what are the glial cells in the CNS?
astrocytes
oligodendrocytes
microglial
ependyma
what is the function of astrocytes in the CNS?
mediate metabolic exchange at neurones: nutrient & waste products between nerve & blood
what is the function of oligodendrocytes in the CNS?
provide myelination for multiple neurones at once
what is the function of microglial cells in the CNS?
immune
what is the function of ependyma cells in the CNS?
ciliated, pump spinal fluid (CSF)
line ventricles & central canal of spinal cord
what is the ganglion?
lots of cell bodies
where the pre ganglionic and post ganglionic nerve fibres meet
what blocks the muscarinic ACh receptor?
atropine
what stimulates AChR?
nicotine
