Peripheral Nervous System and Parts

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Peripheral Nervous System and Parts
2015-02-22 14:33:57
biological psychology
PSY 430,Neuroanatomy
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  1. Peripheral Nervous System (PNS)
    connects the brain and spinal cord to the rest of the body
  2. Two Parts of the peripheral nervous system
    • Somatic Nervous System
    • Autonomic Nervous System
  3. Somatic Nervous System
    consists of axons conveying messages from the sense organs to the CNS and from the CNS to the muscles
  4. Autonomic Nervous System
    sends and receives messages to regulate the automatic behaviors of the body (heart rate, blood pressure, digestion, etc.)
  5. Two Parts of the Autonomic Nervous System
    • Sympathetic Nervous System
    • Parasympathetic Nervous System
  6. Sympathetic Nervous System
    • network of nerves that perpares the organs for rigorous activity
    • Increases heart rate, blood pressure, respiration, etc. (fight or flight response)
    • Comprised of ganglia on the left and right of the spinal cord
  7. Parasympathetic Nervous System
    • facilitates vegetative, nonemergency response
    • decreases functions increased by sympathetic nervous system
    • comprised of long preganglion axons extending from the spinal cord and short postganglionic fibers that attach to the organs themselves
    • Dominant during relaxed states
  8. Postganglionic axons of the parasympathetic nervous system mostly release _____ as a neurotransmitter
    Acetylcholine (Ach)