peripheral NS development - Cole Flashcards
first division of brain marked by flexure
midbrain/ mesencephalon
spinal cord terminates at this level in adult
L2-L3
what is on the inside in spinal cord? gray or white matter?
gray matter!
reversed in brain
bipotential progenitor cell can give rise to
neuronal lineage progenitor cell
glial lineage progenitor cell
glia that stay in ventricular zone become
ependymal cells
stages of neuroblast growth
central process extending to lumen - transient dendrite
disappears, become temporarily round and apolar
2 new cytoplasmic process appear on opposite side to form a bipolar neuroblast
process at one end of cell elongates rapidly to form primitive axon
other end becomes primitive dendrites
signaling at top of neural tube (roof plate) to assign neurons to each layer of spinal cord
BMP4 and 7
triggers TGF-B which triggers BMP5 & 7
signaling at bottom of neural tube (floor plate)
Shh
TF controlling sensory neuron diff.
PAX3/7
TF controlling floor plate diff.
PAX6
types of motor/ efferent ganglia
autonomic (visceral)
sympathetic - chain (paravertebral) and preaortic
parasympathetic (found within walls of viscera)
bundles of axons originating & ending in CNS are called
tracts
axons in PNS are called
nerves
celll bodies in CNS called
nuclei
cell bodies in PNS called
GANGLIA
