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anatomy Ch14h - Human Anatomy McKinley O'Loughlin Chapter...

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Human Anatomy McKinley & O'Loughlin Chapter 14: Nervous Tissue The Nervous System Organization of the Nervous System Structural subdivisions of the nervous system: o Central nervous system (CNS) o Peripheral nervous system (PNS) Functional divisions of the nervous system: o Collecting Information Sensory (or afferent) division o Processing and Evaluation o Responding Motor (or efferent) division Sensory Division The sensory division is subdivided into two components: o Somatic sensory o Visceral sensory Motor Division The motor division is subdivided into two components: o Somatic motor component
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Autonomic motor component (autonomic nervous system; ANS) Cytology of the Nervous System Nerve Cells o Two distinct cell types form nervous tissue. Neurons Glial cells Characteristics of Neurons Neuron Structure o A typical neuron has a cell body, dendrites, and axons. Cell Body (soma) o Nissl bodies Dendrites Axon o The larger, typically longer nerve cell process emanating from the cell body is the axon, sometimes called a nerve fiber.
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