basics 1 Flashcards
(50 cards)
What makes up the nervous system (7)
brain 12 pairs of cranial nerves + branches spinal cord 31 pairs of spinal nerves + branches ganglia enteric plexus sensory receptors
3 types of neurons based on their function
sensory (afferent)
interneuron
motor (efferent)
CNS made up of
brain
spinal cord
PNS made up of
cranial nerves
spinal nerves
ganglia
sensory nerves
sensory nerves also called
afferent
motor nerves also called
efferent
PNS is also then subdivided into…
somatic nervous system
autonomic NS
enteric NS
The SNS made up of/does what
1) neurons that conduct impulses from somatic and special sensory receptors to the CNS
2) motor neurons from from CNS to skeletal muscle
ANS consists of
sensory neurons from visceral organs, motor neurons from CNS to smooth, cardiac muscle & glands
ENS consists of
2 plexuses that control GI
monitors sensory changes and controls operations
resting membrane potential of neutron
- 70mV
what forms myelin sheaths
oligodendrocytes
what forms blood brain barrier
astrocytes
what has phagocytic functions in NS
microglia
autonomic NS innervates what
visceral structures (maintains homestasis)
grey matter is rich in
cell bodies
white matter is in
axons
cluster of cell bodies with similar functions are called?
nuclei
what word means “crosses over”
decussates
which germ layer gives rise to nervous system
ectoderm (also skin)
embryology progression to neural tube
ectoderm > neural plate > neural grove with neural fold > neural folds fuse to form neural tube
where do you find grey matter
centre of spinal cord and outer regions of brain (cerebral cortex)
forebrain called
prosencephalon
midbrain called
mesencephalon
