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48 Cards in this Set

  • Front
  • Back
3 Layers of Neural Tube
Ventricular zone or ependyma a
intermediate zone

marginal zone
ventricular zone or ependyman
found around lumen (central canal of the tube
intermediate zone
formed by dividning of ventricular zone and stretches between ventricular surface and outer pial layer
becomes gray matter
external marginal zone
process of nerve cells in the intermediate zone
dendrite
receptive part of neuron
conduting (propagating or transmiting)
axon
end of axon
synaptic terminal or arborizations,
Neuron's cell body
called soma or perikaryon
axon aries from
neurons
axon is coverbed by a membrane
axolema
Cytoskeleton consist of
neurofilaments and microtubules runs through the axon
Microtubules provide a
framework for fast axonal transport
specialized molecules motor
kinesin molecules ATP
axolema cotains high density of sodium
act as trigger zone
axon hilloc- cone shaped portion of the cell
found in large neurons
myelin
axon are covered by
axon is mutiple concentric layers of lipid-rich membran produced by Schwann cells in
PNS
oligodendrocytes
CNS for axon
Myelin sheath is divided into segment
Nodesof Ranvier
smallest axon
unmyelinated
from synaptic terminals to the cell body
retrograde transport
anterograde transport
from cell body to the synaptic terminal
after injury to the axon, the neuronal cell body responds by enterign
axon reaction or chromatolysis
CNS
axon can not generate after injury
PNS
axon can generate after injury
Communication
Synaptes
axosmatic
inhibitory
electrical synapese or gap junctions
chemical transmiters subtannce in CNS
transmters
acetylcholine and catechloamine
Laminas
Cerebral and cerebellar cortices, cell bodies aggregate to form layers called
Nerve cell bodies in the spinal cord, brain stem, and cerebrum form
compact groups, nuclei
Each nucleus contains
projection neurons
Peripheral nervous system, compcact groups of nerve cell bodies are called
ganglia
axon bundles are identified
tracts or fasciculi
aggregates of tracts in the spinal cord are
columns or funiculi
neutropil
axons are intermingled with dendrites and do not run in bundles so that pathways are difficult to identify
Neuroglia
____ outnuber neurons in the brain and spinal cord 10:1
Neuroglia cells
do not form synapses, appear to play important roles in myelin formation, guidance of developing neurons, maintenance of extracellualr K, reuptake of transmitters
Macroglia
refers to astrocytes and oligodendrocytes derived from ectoderm, capablity to regenerate
two classes of astrocytes
Protoplasmic and fibrous
Protoplasmic astrocytes are
delicate, occur in gray matter or satellite cells in dorsal root ganglia
Fibrous astrocytes are
fibrous, contain glial fibrils,
astrocytes
surround blood vessels in nervous system, cover exterior surface of brain and spinal cord
astocytes maintain K concentration within extracellular, contribute formation of the blood-brain barrier, can take up material to provide optimal environment
astrocytes
astrocytes contain protein
glial fibrillary acidic protein
Chronic astrocytic proliferation leads to
fibrillary gliosis or glial scarring
Oligodendrocytes
white matter; they form myelin in the CNS and provide nutritive support to the neurons they envelop
A single oligodendrocytes may wrap around mutliple axons
T or F
True, an oligodendrocytes may myelinate up to 40-50