Neurons, Nerve Fibers and Peripheral Nerves

Neurons, Nerve Fibers and
Peripheral Nerves
Neurons, Nerve Fibers and
Peripheral Nerves
Curriculum : Phase 2/Semester2/TOB /Session 11
2017/2018
Lecturer : Dr. Rajaa Ali Al- Taee
Msc. PhD. Histology G.mail: dr.rajaaali@gmail.com
Hammurabi Medical Collage / Babylon University
Objectivesofthelecture:
Havingrevisedthislectureyoushouldbeableto:
?describethestructureofaperipheralnerve.
?recognisethedifferencebetweenmyelinatedandnon-myelinatednervefibresandascribeparticularrolestoeach.
?outlinethegreatvarietyofsynapticconnectionsinthenervoussystem.
?identifynervefibresinbothcrossandlongitudinalsection.
?relatedemyelinationtoaslowingofconductionvelocitywithinanerve.
Terminology
?Neuron=nervecell.
?Neuroglia=supportingcell.
?Nervefiber=longaxon.
?Nerve=collectionofnervefibers(axons)inPNS.
?Tract=collectionsofnervefibers(axons)inCNS.
?Nucleus=clusterofcellbodiesinCNS.
?Ganglia=clusterofcellbodiesinPNS.
Rememberalso:
?CNSvsPNS.
?Input:sensory:afferent:tobrain.
?Output:motor:efferent:frombrain.
?DensenetworkoffibersfromprocessesofbothneuronsandglialcellsfillstheinterneuronalspaceoftheCNSandiscalledtheneuropil.