14 Anatomy

14 Anatomy - Chapter 14 NERVOUS TISSUE ORGANIZATION A....

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Chapter 14 NERVOUS TISSUE ORGANIZATION A. Structural 1. Central nervous system (CNS) includes brain (protected by the skull) and the spinal cord (protected in the vertebral canal) 2. Peripheral nervous system (PNS) includes cranial nerves, spinal nerves, and ganglia –clusters of cell bodes that extend outside of CNS Together the CNS and PNS function together to do 3 things. . 1. Receptors of the PNS (dendrite endings) detect changes in the environment and pass them to the CNS 2. The CNS processes the info and determines what response to take 3. CNS initiates specific nerve impulses motor output –which travels through the PNS to effectors muscles or glands B. Functional 1. Sensory division receives sensory info from receptors and transmits (afferent) it to the CNS. .responsible for input contains both PNS and CNS components a. Somatic sensory ---general somatic senses (touch, pain, pressure, pain, vibration) b. Visceral sensory ---transmit nerve impulses from b. vessels and viscera of organs to the CNS (most of the time you are not aware of visceral sensory except in extreme cases—hunger) 2. Motor division transmits motor impulses from the CNS to (efferent) muscles/glands. .responsible for output contains both PNS and CS components a. Somatic motor system (SNS)---conduct nerve (voluntary nervous system) impulses from the CNS to skeletal muscles contraction
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b. autonomic nervous system (ANS)---innervates int, (involuntary NS) organs, smooth/cardiac muscle, and glands w/out our control NERVOUS TISSUE neurons (35-100billion) gilal cells (100billion-1trillion) A. NEURONS excitable cells that initial AND transmit nerve impulses high metabolic rate (needs lots of O2 and glucose) longevity (still have most neurons from your fetal period) their capability to divide is lost during the fetal period (unmitotic)
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This note was uploaded on 11/16/2010 for the course BIO 2233 taught by Professor Neff during the Spring '09 term at Temple.

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14 Anatomy - Chapter 14 NERVOUS TISSUE ORGANIZATION A....

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