Nervous System General Flashcards
anatomical division
where nerves situated
central nervous system
protected in boney cavities
ex: spinal cord
peripheral nervous system
do not need to open cavity
ex: cranial nerves
somatic nervous system
voluntary
autonomic nervous system
involuntary
ex: heart
ectoderm
neural tissue, most superficial
mesoderm
form structure in middle of body
endoderm
epithelium of digestive and respiratory systems
most internal layer
neural plate
formed by ectoderm dorsal to notochord of mesoderm
neural groove
cells in neural plate form
neural crests
form most of PNS including ganglia
neural tube
formed by rest of cells in neural groove
forms CNS including spinal cord
pyramidal decussation
limit between spinal cord and brainstem
place where upper motor neurons cross over to opposite side of spinal cord
medullary cone
caudal end of spinal cord
longer in cats (S2-3) than dogs(L6-7)
sesnory/ afferent
from the body toward CNS
motor/ efferent
toward muscle/ gland
pseudounipolar neurons
describes afferent neurons
somas group together
gse
general somatic efferent
motor impulse to a muscle that stimulates contraction
upper motor neuron
confined to CNS (brain and spinal cord)
damage to could still have reflexes
lower motor neuron
cell body in CNS but axon in periphery
damage will result in loss of reflexes
GSA
general somatic afferent
transmit sensory impulse toward CNS
can be tactile and nociception or proprioception
myotatic reflex arc
stretches extensor m, stimulating its contraction via reflex arc, flexor m inhibited
3 parts: sensory input, central connection and output
