Course Hero Logo

HHIS-LAB-WEEK13.pdf - FINALS: NERVE TISSUES HHIS211 HUMAN...

Course Hero uses AI to attempt to automatically extract content from documents to surface to you and others so you can study better, e.g., in search results, to enrich docs, and more. This preview shows page 1 - 2 out of 3 pages.

FINALS: NERVE TISSUESBSMLS |pg. 1HUMANHISTOLOGYBSMLSTERM02HHIS211LABORATORYNERVE TISSUETwo important cell types found in the nerve tissueoprincipal cellsneuronsosupporting cellsglial cellsResponsible for the production and induction of electricalimpulses.It allows us to receive stimuli and process the information.The most complex system in the body, is formed by anetwork of many billion nerve cells (neurons), assisted bymany more supporting cells called glial cellsNervous Tissue has two major divisions:Central Nervous System (CNS)oComposed of the cerebrum, cerebellum (brain)and the spinal cord.Peripheral Nervous System (PNS)oAll nervous tissue outside the CNS.oIt is organized to form 12 pairs of cranial nerves,31 pairs of spinal nerves and their associatedganglia.NEURONSThe neurons consist of principal components.In the pictures presented earlier, we were able to identifythedifferent components: cell body or perikaryonincluding the processes: dendrites and axon.odifferent components: cell body or perikaryonoprocesses:dendrites and axonThe functional unit in both the CNS and PNS is the neuronor nerve cellMost neurons consist of three main parts:The cell body, or perikaryonocontains the nucleus and most of the cell’sorganelles and serves asthe synthetic or trophiccenter for the entire neuronDendritesothe numerous elongatedprocesses extending fromthe perikaryon andspecialized to receivestimuli from other neuronsat unique sites calledsynapses.Axonosingle long process ending at synapsesspecialized to generate and conduct nerveimpulses to other cells(about the photo)showing the other components asidefrom the principal components.SLIDES TO REVIEW (MOTOR NEURON)Micrograph of a large motor neuronshowing the large cell body andnucleus (N), with a long axon (A)emerging from an axon hillock (AH)and several dendrites (D).Evenly dispersed Nissl substance(NS) can be seen throughout the cellbody and cytoskeletal elements canbe detected in the processes.Nuclei of scattered glial cells (G) are seen among thesurrounding tissue.(About the photo)as you can observe if you would beasked to identify the specific type of neuron.Structurally, you would be able to identify it clearly as amultipolar type of neuron.To recall, we differentiated the structural types of neuronsbased on the number of processes. Makikita sa picturethat it is a multipolar neuron type since it consists ofseveral processes so there are several dendritescontained in the neuron including the single axon.Main components of the neuron: cell body, at themiddle of the cell body where the nucleus is locatedlabeled as N.The location and shape of the nucleus would also varyfrom one neuron to another.

Upload your study docs or become a

Course Hero member to access this document

Upload your study docs or become a

Course Hero member to access this document

End of preview. Want to read all 3 pages?

Upload your study docs or become a

Course Hero member to access this document

Term
Spring
Professor
NoProfessor
Tags

Newly uploaded documents

Show More

Newly uploaded documents

Show More

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture