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Final Neural Histology Review
29 cards·by kayleeallen27
what is another name for the integration center?
the central nervous system
what type of neuron is found in the CNS?
association neurons
what is another name for an afferent neuron (or for the afferent system)?
CNS
where are neural impulses from CNS headed?
sensory
a motor neuron is found in what portion of the PNS?
efferent
what does a motor neuron stimulate?
muscles organs and glands
which part of a neuron recieves the impulses?
dendrites
what is the difference between an oligodendrocyte and a swann cell?
their location; oligodendrocytes are in CNS swann cells are in PNS
what do oligodendrocytes and swann cells have in common?
they are both myeline sheaths
name the cells which deliever nutrients to neurons
neuroglial/astrocytes
what does the perinerium wrap around?
fasicle (bundle of nerves)
a resting neuron has what charge inside compared with outside
negative inside, there is an excess of negative ions
what does depolarization reefer to?
to become positive
how does depolarization happen
a stimulus changes the permeability
what is a gap between neurons
synaptic cleft
in what portion of a neuron are neurotransmitters produced?
axon
why are impulses unidirectional?
because impulses always travel away from the perikaryon
what does an excitatoy neurotransmitter do
brings the voltage closer to threshold potiental by increasing permeability of the plasma
membrane
where are the receptors for an excitatory neurotransmitter found
dendrites
what does facilitation refer to?
a subthreshold stimulus that does not start an impulse but allows the next one to
where are the perikaryons of a sensory neuron found?
dorsal root ganglion
where are the perikaryons of a motor neuron found
ventral root
what is an effector
motor neuron
what is really happening when an impulse travels down the axon
self perpetuating wave of action poteintial
in PNS neuron which is myelinated where does the depolarization actually take place
nodes of ranvier
what is a subthreshold stimulus
a stimulus that wont start a new impulse but facilitates a future impulse
when you say a neuron is polarized what does it mean
there is a speration of charges so the inside is more negative. this is due to the sodium
potassium pump
differentiate between an action potential and a resting potential
action potential is moving down the axon, resting has no movement
what is the significance of nodes of ranvier
speed up an impulse where depolarization occurs in a myelinated cell