Histology of the CNS Flashcards
most common excitatory NT
glutamate
meissner’s corpuscles (light touch) cell bodies are located in..
the DRG
glial cells vs neurons on cell division
neurons rarely divide; glial cells divide
spinal cord H is made up of
grey matter (unmyelinated)
axons are made up of ____ that form _____
white matter; white matter tracts (like the corticospinal tract)
upper motor neurons are contained in the
brain
lower motor neurons are contained in the
spinal cord
the cerebral cortex cell bodies are made of which type of matter?
grey matter (cortex is on outside/ made of neuron cell bodies)
the PNS consists of
axons (to skeletal muscle is referring to motor neurons)
stain used to stain myelin of the axons
cresyl violet stain
a cluster of neurons outside the CNS is termed
ganglion
a cluster of neurons inside the CNS is termed
nucleus
smooth muscle/gland motor innervation is done by
autonomic NS
brain stem or spinal cord autonomic neurons are termed
preganglionic
autonomic ganglion (outside the CNS) are termed
postganglionic
3 famous motor neurons
purkinje, pyramidal, alpha motor neurons
where are purkinje motor neurons located?
cerebellum (damage would cause tremors, ataxia)
where are pyramidal motor neurons located?
cerebrum, upper motor neurons
where are alpha motor neurons located?
brainstem, spinal cord, lower motor neurons (damage would cause twitching, vasiculation)
what are interneurons?
inhibitory usually between 2 neurons*
largest neurons in the cerebellum?
purkinje neurons
**upper motor neurons are made of ___ found in the ____
pyramidal neurons* in the cerebral cortex (cereBRAL, pyramiDAL)
where are alpha motor neurons found?
lower motor neurons (ventral horn of spinal cord, to skeletal muscles, in brainstem motor nuclei)
where are preganglionic cell bodies located?
brainstem nuclei, lateral horn of spinal cord
