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27 terms

a&p lab final study NERVOUS

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dendrites
location where neuron recieves stimuli from other environments or neurons
perikaryon
neuron cell body
axon
carries information toward other cells
retrograde flow
axon information back toward cell body
axon hillock
base or initial segment of axon
axolemma
plasma membrane of axon
axoplasm
contains structural componants of axon
telodendria
axonal extensions at the end of axon trunk
neurotransmitters
chemical messengers synthesized in cell body
presynaptic membrane
where neurotransmitters are released
postsynaptic membrane
bears receptors for neurotransmitters
schwann
cell that forms myelin sheath in PNS
oligodendrocytes
cell that forms myelin sheath in CNS
central
nervous system consisting of brain and spinal cord
peripheral
nervous system consisting of nerves outside of spinal cord
cervical
phrenic nerve is in what plexus
bronchial
radial nerve is in what plexus
lumbar
femoral nerve is in what plexus
sacral
sciatic nerve is in what plexus
sympathetic
nervous system: increase heart rate
parasympathetic
nervous system: decrease heart rate
sensory
relfex arc step 1 - detects stimuli
interneuron
reflex arc step 2 - carries information
motor neuron
reflex arc step 3 - sends stimuli to muscle
muscle
reflex arc step 4 - muscle reacts
-70
resting potential
-55
threshold