anatomy 2 - Introduction to the Nervous System Reflex Arcs...

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Introduction to the Nervous System, Reflex Arcs & Vision: I. Histology of Nervous Tissue Nervous system is the master integrating and coordinating system. Two principle cell types: Neuroglia- supporting cells Neurons- Excitable cells, basic functional units of nervous tissue. Anatomy of a typical multipolar neuron Cell body- large rounded portion that contains cytoplasm and a nuclei. Processes of neurons: Dendrites- receptive regions May have many per cell Axons- conduct impulses Only one per cell Pathway of stimuli in a neuron: 1) Dendrites 2) Cell Body/Nuclei 3) Axon 4) Terminals- send signal to next tissue, etc. (Below: Illustration of a typical multipolar neuron) Neuron Classification Structurally Vs. Functionally: Organization of Nervous System Central (CNS) Peripheral (PNS) Afferent Nerves/Neurons- Carry impulses to CNS
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Efferent Nerves/Neurons- Carry impulses out of CNS II. Reflex Physiology Reflex- automatic response Autonomic Reflexes- not aware of
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anatomy 2 - Introduction to the Nervous System Reflex Arcs...

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