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1-28 - Nervous System (the basic premise) afferent input...

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1 Nervous System (the basic premise) Figure 11.1 “afferent” input “efferent” output Peripheral Nervous System Central Nervous System
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2 Organization of the Nervous System Peripheral nervous system (PNS) Paired spinal and cranial nerves Carries messages to and from the spinal cord and brain Central nervous system (CNS) Brain and spinal cord Integration and command center
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3 Sensory (afferent) division Sensory afferent fibers – carry impulses from skin, skeletal muscles, and joints to the brain Visceral afferent fibers – transmit impulses from visceral organs to the brain Peripheral Nervous System (PNS): Two Functional Divisions Motor (efferent) division Transmits impulses from the CNS to effector organs 2 main divisions Somatic Skeletal muscle Autonomic Cardiac and smooth muscle, glands, etc. Somatic NS has 1 motor neuron Autonomic NS has 2 motor neurons
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Myotomes (motor organization)
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5 Dermatomes (sensory organization) Figure 13.12
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Autonomic Nervous System: Sympathetic and Parasympathetic Divisions “fight or flight” “rest and digest”
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7 Support and brace neurons Anchor neurons to their nutrient supplies Guide migration of young neurons Control the chemical environment Supporting Cells (Neuroglia): Astrocytes
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8 Microglia – small, ovoid cells with spiny processes Phagocytes that monitor the health of neurons -work like macrophages and engulf foreign debris/metabolic end products Supporting Cells (Neuroglia): Microglia
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9 Oligodendrocytes – branched cells that wrap CNS nerve fibers
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This note was uploaded on 09/02/2010 for the course OT 261 taught by Professor Howell during the Spring '07 term at USC.

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1-28 - Nervous System (the basic premise) afferent input...

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