Chapter 7 review Flashcards
consists in the cns
brain and spinal cord
What makes up the PNS
nerves outside the cns
what are satelite cells
protect neuron cell bodies
What are schwann cells
produce myelin sheath in PNS
What are Oligodendrocytes
wrap their extensions around the nerve, form myelin sheath in the cns
what is the function of microglia
dispose of debris - dead cells and bacteria
what are ependymal
circulate cerebrospinal fluid in the cilia
what are astrocytes
star-shaped, form barrier between capillaries and control chemical environment
what do schwann cells do
produce myelin sheath
what do nodes of ranvier do
gaps between myelin sheath
what are the 2 parts neuron
cell body and processes
what is nissle substance
specialzed rough endoplasmic reticulum
what is neurofibrils
intermediate cytoskeleton that mainatins cell shape
what are bundles of fibers that are found in the CNS called
tracts
What are bundles of fibers that are found in PNS called
nerves
Ganglia
collections of cell bodies outside the central nervous system
gray matter
outer layer; unmyelinated fibers and cell bodies
white matter
myelinated fibers, found in gray matter
what are efferent
travels away from cns
what are afferent
travels away from stimulus to cns
what are inter
connect sensory and motor neurons
multipolar
many extensions from cell body
bipolar
one extension and one cell body
unipolar
single short process leaving the cell body
ratio sodium/potassium
3/2
action potential is _______________
all or nothing
At rest the membrane is
polarized
action potential causes the membrane to be
depolarized
sequence of action potential
membrane becomes depolarized, sodium rushes in, potassium rushes out, sodium potassium pump replaces it, can’t go again until goes all the way through
synaptic cleft
gap between adjacent neurons
synapse
junction between nerves
2 main functions of neurons
irritability and conductivity
irritability
ability to respond to stimulus
conductivity
the ability to transmit a message
what are the 3 parts of the brainstem
medullary oblogata, pons, midbrain
stroke
brain clots in the brain
heart attack
blood clots in the heart
temporal
auditory and encoding memory
parietal
controls senses
frontal
higher level thinking, voluntary movement
occipital
visual, color
pons
controls breathing
cerebral spinal fluid
shock absorber
