Lab 12: Nervous system Flashcards
describe locations of gray matter and white matter of cerebrum
gray = peripherally located
white = centrally located
Opposite of spinal cord
describe gray matter of cerebrum
contains several sublayers
mostly unmyelinated axons
Pyramidal neurons + glia
describe white matter of cerebrum
no neuron cell bodies
mostly myelinated axons + glia (by oligodendrocytes)
describe pyramidal cell neurons (in gray matter of cerebrum)
multipolar
large
prominent nucleus and nucleolus
appears triangular in section
located deep in gray matter near the white matter
few/no nissl bodies
describe orientations of gray and white matter of cerebellum
gray = peripherally located
white = centrally located
name layers of gray matter of cerebellum
molecular layer
purkinje layer
granular layer
describe molecular layer of gray matter of cerebellum
outermost
neuronal and glial cell processes
neuron cell bodies
describe purkinje layer of gray matter of cerebellum
purkinje cell
multipolar
large nucleus and prominent nucleolus
dendrite projections towards molecular layer
axon projections towards granular layer
describe granular layer of gray matter of cerebellum
innermost layer of gray matter
very cellular
glial cell bodies
describe white matter of cerebellum
myelinated axons + glial cells
describe gray matter of spinal cord
glial cells, neuron cell bodies, mostly unmyelinated axons
ventrally, neuron cell bodies are of large multipolar motor neurons
gray matter in H shape
motor neurons + glia
describe motor neurons
have large nucleus
prominent nucleolus
many nissl bodies (RER & RNA = basophilic)
multipolar
how to tell between axons and dendrites
dendrites have nissl bodies
axons do not have nissl bodies
what is the meshwork of fibers in spinal cord
axons and dendrites
what makes myelin in CNS
oligodendrocytes
name glial cells in CNS
astrocytes
oligodendrocytes
microglial
describe white matter of spinal cord
no neuron cell bodies (of motor neuron)
nuclei belong to glial cells
myelinated axons (by oligodendrocytes)
myelinated axons + glia
describe myelin
fatty lipid substance
Solubilized during preparation of slides
so we only see space where myelin used to be
in white matter describe how axons and glial cells appear
axons appear pink - acidophilic
nuclei of glial cells appear basophilic = blue
what is ependymal canal
central canal of spinal cord
describe peripheral nerve (PNS)
no neuron cell bodies in peripheral nerves (they are in CNS)
axons appear as acidophilic - pink dots
axons here are surrounded by myelin
myelin in PNS is made by
schwann cells
1 schwann cell is associated with
1 myelinated fiber
many unmyelinated fibers
nuclei present in peripheral nerves are from what
schwann cells
fibrocytes
describe ganglion
neuron cell bodies + satellite cells (glia)
describe satellite cells
cells surrounding surface of a nerve cell body in sensory, sympathetic and parasympathetic ganglia
describe nerve fiber
myelinated axons + schwann cells (glia)
what is peripheral nerve fiber CT
peripheral nerves surrounded by ct to form bundles
name CT layers
endoneurium
perineurium
epineurium
describe endoneurium
few reticular fibers that surrond individual nerve fibers
describe perineurium
thin layer of flattened epithelium like cells
joined by tight junctions
groups nerve fibers into bundles
describe epineurium
dense irregular ct
