Lab 11 ppt - Check List Lecture Ex. 17 Ex. 18A Ex. 18B Ex....

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Check List Lecture Ex. 17 Ex. 18A Ex. 18B Ex. 19 Ex. 20 Videos Nerve Impulse Human Body – Nervous System Sheep Brain Dissection 18B Activities 1-8 Motor Point Activity Start Vernier 14
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Exercise 17: Histology of Nervous Tissue pp. 257-264
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A. Neurons- basic functional units of nervous tissue B. Neuroglia “Nerve Glue”- supporting cells of the central nervous system CNS- central nervous system (brain and spinal cord) Astrocytes- chemical environment around the neurons Oligodendrocytes- myelinate the cytoplasmic extensions of the neurons Microlgia- phagocytes Ependymal Cells- myelinate the cytoplasmic extensions of the neurons PNS- peripheral nervous system (everything else not in the central nervous system Schwann Cells- the principal support of the peripheral nervous system Satellite cells- are small mononuclear progenitor cells with virtually no cytoplasm found in mature muscle
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Neuron Anatomy pp. 258-262 Neurons : basic functional unit Cell Body Nuclei: clusters of cell bodies in CNS Ganglia : clusters of cell bodies outside of CNS Gray Matter Tracts : neuron processes running through CNS forming Nerves in the PNS White Matter Neruofibrils : cytoskeletal elements of the neuron for support and intracellular transport Nissle Bodies (chromatophilic): RER for metabolic activities Dendrites : receptive regions Axons or Nerve Fiber : long process that conducts nerve impulse Collaterals : branch off of axon
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Neuron Anatomy pp. 258-262 Axon Hillock: slightly enlarged portion just distal to the cell body Axon Terminals or Synaptic Knobs : store neurotransmitter chemical in tiny vesicles Synapses or Junctions Synaptic Cleft Myelinated Fibers : nerve fibers covered in a fatty material called myelin Schwann Cells : PNS glial cells that wrap tightly around axon increasing speed of neurotransmission Myelin Sheath : deep layer of schwann cell Neurilemma : superfical layer of schwann cell Nodes of Ranvier or nerurofibril nodes : gaps between schwann cells Oligodendrocytes CNS myelination
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Neuron Classification pp 262-263 Classification by Structure figure 17.5 -number of processes attached to cell body- Unipolar Neurons : one very short process, nearly all neurons that conduct impulses toward the CNS • Peripheral Process • Central Process Bipolar Neurons : two processes, rare found in eye, ear and olfactory Multipolar Neurons : many processes, brain and spinal cord, carry impulses away from CNS
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Neuron Classification pp 262-263 Classification by Function -carry info to or away from the CNS- Afferent or Sensory : carry info to spinal cord, ganglion (outside), unipolar Efferent or Motor : carry signals away from CNS, inside, multipolar Interneurons or Association Neurons : connect sensory and motor neurons, always in CNS, multipolar
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Structure of a Nerve pg. 264 Mixed Nerves : both sensory and motor including all spinal nerves Sensory or Afferent nerves : toward CNS Motor or Efferent Nerves
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This note was uploaded on 09/14/2011 for the course BIO 227 taught by Professor Lonsdale during the Fall '10 term at Boise State.

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Lab 11 ppt - Check List Lecture Ex. 17 Ex. 18A Ex. 18B Ex....

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