Lab 12: Nervous system

Question 1

describe locations of gray matter and white matter of cerebrum

Answer 1

gray = peripherally located
white = centrally located
Opposite of spinal cord

Question 2

describe gray matter of cerebrum

Answer 2

contains several sublayers
mostly unmyelinated axons
Pyramidal neurons + glia

Question 3

describe white matter of cerebrum

Answer 3

no neuron cell bodies
mostly myelinated axons + glia (by oligodendrocytes)

Question 4

describe pyramidal cell neurons (in gray matter of cerebrum)

Answer 4

multipolar
large
prominent nucleus and nucleolus
appears triangular in section
located deep in gray matter near the white matter
few/no nissl bodies

Question 5

describe orientations of gray and white matter of cerebellum

Answer 5

gray = peripherally located
white = centrally located

Question 6

name layers of gray matter of cerebellum

Answer 6

molecular layer
purkinje layer
granular layer

Question 7

describe molecular layer of gray matter of cerebellum

Answer 7

outermost
neuronal and glial cell processes
neuron cell bodies

Question 8

describe purkinje layer of gray matter of cerebellum

Answer 8

purkinje cell
multipolar
large nucleus and prominent nucleolus
dendrite projections towards molecular layer
axon projections towards granular layer

Question 9

describe granular layer of gray matter of cerebellum

Answer 9

innermost layer of gray matter
very cellular
glial cell bodies

Question 10

describe white matter of cerebellum

Answer 10

myelinated axons + glial cells

Question 11

describe gray matter of spinal cord

Answer 11

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

Question 12

describe motor neurons

Answer 12

have large nucleus
prominent nucleolus
many nissl bodies (RER & RNA = basophilic)
multipolar

Question 13

how to tell between axons and dendrites

Answer 13

dendrites have nissl bodies
axons do not have nissl bodies

Question 14

what is the meshwork of fibers in spinal cord

Answer 14

axons and dendrites

Question 15

what makes myelin in CNS

Answer 15

oligodendrocytes

Question 16

name glial cells in CNS

Answer 16

astrocytes
oligodendrocytes
microglial

Question 17

describe white matter of spinal cord

Answer 17

no neuron cell bodies (of motor neuron)
nuclei belong to glial cells
myelinated axons (by oligodendrocytes)
myelinated axons + glia

Question 18

describe myelin

Answer 18

fatty lipid substance
Solubilized during preparation of slides
so we only see space where myelin used to be

Question 19

in white matter describe how axons and glial cells appear

Answer 19

axons appear pink - acidophilic
nuclei of glial cells appear basophilic = blue

Question 20

what is ependymal canal

Answer 20

central canal of spinal cord

Question 21

describe peripheral nerve (PNS)

Answer 21

no neuron cell bodies in peripheral nerves (they are in CNS)
axons appear as acidophilic - pink dots
axons here are surrounded by myelin

Question 22

myelin in PNS is made by

Answer 22

schwann cells

Question 23

1 schwann cell is associated with

Answer 23

1 myelinated fiber
many unmyelinated fibers

Question 24

nuclei present in peripheral nerves are from what

Answer 24

schwann cells
fibrocytes

Question 25

describe ganglion

Answer 25

neuron cell bodies + satellite cells (glia)

Question 26

describe satellite cells

Answer 26

cells surrounding surface of a nerve cell body in sensory, sympathetic and parasympathetic ganglia

Question 27

describe nerve fiber

Answer 27

myelinated axons + schwann cells (glia)

Question 28

what is peripheral nerve fiber CT

Answer 28

peripheral nerves surrounded by ct to form bundles

Question 29

name CT layers

Answer 29

endoneurium
perineurium
epineurium

Question 30

describe endoneurium

Answer 30

few reticular fibers that surrond individual nerve fibers

Question 31

describe perineurium

Answer 31

thin layer of flattened epithelium like cells
joined by tight junctions
groups nerve fibers into bundles

Question 32

describe epineurium

Answer 32

dense irregular ct