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22 Cards in this Set
- Front
- Back
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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 |
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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 |
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parts of a neuron
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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 |
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Axon terminals in somatic vs autonomic
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autonmic = boutons
somatic = endplates |
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most cells are
multipolar bipolar pseudo-unipolar |
multipolar
bipolar = retinal pseudo-unipolar - spinal ganglion (dorsal root ganglion) |
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PNS neurotransmitters
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AcH, epi norepi peptides NO
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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 |
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PNS glia
2 |
Schwann - myelin
satellite - PNS environ |
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Fibroblasts
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present in CT of nerve
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Myelination in PNS schwann
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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 |
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schwann cell cytoplasm
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peripheral
periaxonal |
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myelination composition
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myelin basic protein MBP
proteolipid protein (PLP) Po protein |
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unmyelinated axon
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mesaxon
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Epineurium
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entire nerve
dense CT, loose adipose, continuous with dura mater in spinal |
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perineurium
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surrounds fasicles(bundles of axons)
2-5 layers squamos epith bounded on inner and outer surface by basal lamina |
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endoneurium
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indv nn fibers
reticular collagen few fibroblasts |
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Sensory ganglia
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dorsal root
conveys info to spinal cord Fasicle runs through the center closley packed neurons satellite cells surround bodies |
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Autonomic
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Parasympathetic and sympathetic
eccentric nuclei neurons scattered among other cell types satellites discontinuous CT between cells, not just dense capsule |
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Sympathetic ganglia
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chain ganglia and prevertebral ganglia(aorta)
T1-L3 N2->alpha and beta |
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parasympathetic
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preganglionic originates in nuclei of medulla and midbrain
S2-S4 N2-> Muscarinic |
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enteric gangli
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gut motility and secretion
symp and parasymp regulation peptides modulate function |
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sweat glands and adrenal glands recieve only para or symp?
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sympathetic innervation
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