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Chapter 11 Part 1 Fundamentals of CNS

Chapter 11 Part 1 Fundamentals of CNS - Chapter 11...

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Chapter 11 Fundamentals of the Nervous System and Nervous Tissue Part 1 Angela Peterson-Ford, PhD E209 [email protected]
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Nervous System The master controlling and communicating system of the body Functions Sensory input – monitoring stimuli occurring inside and outside the body Integration – interpretation of sensory input Motor output – response to stimuli by activating effector organs
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Nervous System Figure 11.1
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Organization of the Nervous System Central nervous system (CNS) Brain and spinal cord Integration and command center Peripheral nervous system (PNS) Paired spinal and cranial nerves Carries messages to and from the spinal cord and brain
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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 Motor (efferent) division Transmits impulses from the CNS to effector organs Peripheral Nervous System (PNS): Two Functional Divisions
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Somatic nervous system Conscious control of skeletal muscles Autonomic nervous system (ANS) Regulates smooth muscle, cardiac muscle, and glands Divisions – sympathetic and parasympathetic Motor Division: Two Main Parts
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The two principal cell types of the nervous system are: Neurons – excitable cells that transmit electrical signals Supporting cells – cells that surround and wrap neurons Histology of Nerve Tissue
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The supporting cells (neuroglia or glial cells): Provide a supportive scaffolding for neurons Segregate and insulate neurons Guide young neurons to the proper connections Promote health and growth Supporting Cells: Neuroglia
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