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22 Cards in this Set

  • Front
  • Back
Activation of muscle in
cardiac
smooth
skeletal
cardiac: autonomic NS regulates not initiates

smooth: autonomic NS inhib and excite

skeletal: motor neurons of somatic voluntary NS, inhibition indirect by inhib neurons
PNS vs CNS
derived from
myelin cells
Pns: derived from neural tube, oligodendrocytes, throusands of types of neurons, several non neuronal cells

CNS: neural crest
schwann cells, several types of neurons, fewer types of glia
parts of a neuron
cell body - LARGE(5-20 um)ER, perikaryon, soma Nissle bodies

dendrites - short tapered covered in spines, Microtubules, Neurofilaments

Axons - thinner, Microtubules, Neurofilaments

Growth cones
Axon terminals in somatic vs autonomic
autonmic = boutons
somatic = endplates
most cells are
multipolar
bipolar
pseudo-unipolar
multipolar

bipolar = retinal
pseudo-unipolar - spinal ganglion (dorsal root ganglion)
PNS neurotransmitters
AcH, epi norepi peptides NO
CNS glia
5
DONT HAVE TO ID IN LAB, but do have to know em

oligodendroglia - form myelin
astroglia - may reg CNS environ

radial glia - neuronal migration

microglia - phagocytic

ependymal cells - make epithelium that line spaces in brain called ventricles and the central canal, also secrete CSfluid in spine
PNS glia
2
Schwann - myelin
satellite - PNS environ
Fibroblasts
present in CT of nerve
Myelination in PNS schwann
nodes of ranvier
internodes
major dense lines
spiral = plasma mem is connected externally
internal connections via clefts of schmidt lanterman - shcwann cell cytoplasm, turnover of inaccessible myelin proteins
schwann cell cytoplasm
peripheral
periaxonal
myelination composition
myelin basic protein MBP
proteolipid protein (PLP)
Po protein
unmyelinated axon
mesaxon
Epineurium
entire nerve
dense CT, loose adipose, continuous with dura mater in spinal
perineurium
surrounds fasicles(bundles of axons)

2-5 layers squamos epith

bounded on inner and outer surface by basal lamina
endoneurium
indv nn fibers
reticular collagen
few fibroblasts
Sensory ganglia
dorsal root
conveys info to spinal cord
Fasicle runs through the center
closley packed neurons
satellite cells surround bodies
Autonomic
Parasympathetic and sympathetic

eccentric nuclei
neurons scattered among other cell types
satellites discontinuous
CT between cells, not just dense capsule
Sympathetic ganglia
chain ganglia and prevertebral ganglia(aorta)

T1-L3
N2->alpha and beta
parasympathetic
preganglionic originates in nuclei of medulla and midbrain

S2-S4
N2-> Muscarinic
enteric gangli
gut motility and secretion
symp and parasymp regulation
peptides modulate function
sweat glands and adrenal glands recieve only para or symp?
sympathetic innervation