The Nervous Syste4

The Nervous Syste4 - The autonomic nervous system has...

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The Nervous System Functions of the Nervous System The functions of the nervous system are the accomplishment of mental activity, the control of homeostasis, the regulation of other systems, and the control of skeletal muscles. Divisions of the Nervous System The central nervous system (CNS) consists of the brain and spinal cord, whereas the peripheral nervous system (PNS) consists of nerves and ganglia. The afferent division of the PNS transmits action potentials to the CNS; the efferent division carries action potentials away from the CNS. The somatic motor nervous system innervates skeletal muscle and is mostly under voluntary control. The autonomic nervous system innervates cardiac muscle, smooth muscle, and glands, and it is mostly under involuntary control.
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Unformatted text preview: The autonomic nervous system has sympathetic and parasympathetic divisions. Cells of the Nervous System Neurons o Neurons receive stimuli and transmit action potentials. Neurons consist of a cell body, dendrites, and an axon. o Neurons are multipolar, bipolar, or unipolar. Neuroglia o Neuroglia are the support cells of the nervous system. They include astrocytes, microglia, ependymal cells, oligodendrocytes, and Schwann cells. Myelin Sheaths o Axons are either unmyelinated or myelinated. Organization of Nervous Tissue o Nervous tissue consists of white matter and gray matter. White matter forms nerve tracts in the CNS and nerves in the PNS. Gray matter forms the cortex and nuclei in the brain and ganglia in the PNS....
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