Course Hero Logo

AnatomyLab3.docx - Lesson 9 Chapter 15: Nervous Tissue -...

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 - 3 out of 5 pages.

Lesson 9Chapter 15: Nervous Tissue-Nervous tissue is composed of both: (1)Neuronsand (2)Neuroglia1.Neurons: Nerve cells that function totransmit electrical impulses2.Neuroglia: Cells thatsupport the neurons-Main divisions of the nervous system: (1)Central Nervous Systemand (2)Peripheral Nervous System1.Central Nervous System (CNS): Composed of the brain and spinal cord2.Peripheral Nervous System (PNS): Composed of the nerves that leave the CNSAnatomy of a Neuron-Soma: The neuron’s cell body (a cluster of cell bodies in thePNS is known as a ganglion; while in the CNS it is a nucleus)-Axon Hillock: Tapered structure between soma and axon (important for producing the action potential)-Dendrites: Processes that conduct electrical impulses towards the soma (usually receives a signal from another cell)-Axon: Processes that conduct electrical impulses away from the soma (in the CNS, a bundle of these processes form tracts; inthe PNS, these axon bundles form nerves)-Axon/Synaptic Terminal: Found at the end of an axon-Synaptic Cleft: Gap found between the axon of one neuron and the target cell-Neuroplasm: Cytoplasm of neurons-Neurofibrils: Cytoskeletal elements of neurons-Nissl Bodies: Chromatophilic substance; rough endoplasmic reticulumNeuroglia-There are two neuroglia that produce myelin: (1)Oligodendrocytesand (2)Schwann Cells1.Oligodendrocytes: Located in theCNS2.Schwann Cells: Located in thePNS-Neuroglia are important to neuron function; they can:1.Produce myelinto insulate a neuron’s axon2.FormNodes of Ranvier found between myelinated sections of the axon; these nodeshelp propagate and increaseactionpotentialStructural Types of Neurons-Neurons can be classified by their morphology:1.Unipolar: One very short process dividing into peripheral and central processes from the soma2.Bipolar: Two processes attached to the soma3.Multipolar: Many dendrites and one axon attached to soma
-There are three functional types of neurons: (1)Sensory/Afferent Neurons, (2)Motor/Efferent Neurons, and (3)Interneurons1.Sensory/Afferent Neurons: The neurons carrying impulsesfrom sensory receptors to the CNS(Usually UNIPOLAR)2.Motor/Efferent Neurons: The neurons carrying impulsesaway from CNS to muscles and glands(UsuallyMULTIPOLAR)3.

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 5 pages?

Upload your study docs or become a

Course Hero member to access this document

Term
Summer
Professor
N/A
Tags

Newly uploaded documents

Show More

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture