Ch. 17 Nervous - tortora

Ch. 17 Nervous - tortora - Nervous Tissue 1 Nervous System...

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1 Nervous Tissue
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2 Nervous System Nervous System Provides sensory, integrative, and motor functions to the body. Composed of neurons and neuroglial cells
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3 Nervous System Neurons Masses of nerve cells that transmit nerve impulses along nerve fibers to other neurons Neuroglial cells Specialized cell that supports function of neuron
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4 Nervous System 2 divisions Central Nervous System (CNS) Brain and spinal cord Peripheral Nervous System (PNS) Cranial nn. and their branches (12) Spinal nn. and their branches (31) – 31 vertebrae Ganglia – bundles of nervous tissue outside of spinal cord Enteric plexuses – regulate digestive system Sensory receptors – monitor changes in internal and external environment
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5 cCNCNCNS PNS
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6
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7 Nervous System Sensory function – via sensory receptors detect stimuli in the internal and external environments sensory information is transmitted by sensory or afferent neurons to the brain or spinal cord Integrative function – via interneurons analyze the sensory information provides perception, storage of info., and making decisions regarding appropriate behaviors Motor function – via motor or efferent neurons respond to integration decisions initiating actions in effectors, including muscle fibers and glandular cells
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8
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9 Somatic – (reacts with the skeletal muscles) Autonomic- (digestive) non-thinking about it Enteric- digestive substance (acid & saliva)
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10 Peripheral Nervous System 3 division Somatic Autonomic Enteric
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11 Peripheral Nervous System Somatic sensory neurons convey information from skin, skeletal muscles, joints, and for the special senses (vision, hearing, taste, and smell) to the CNS Somatic motor neurons convey information from the CNS to skeletal muscles only results in a muscular contraction
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12 Peripheral Nervous System Autonomic sensory neurons
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Ch. 17 Nervous - tortora - Nervous Tissue 1 Nervous System...

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