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Nervous System Summary

Nervous System Summary - BMED 3100 Systems Physiology...

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BMED 3100: Systems Physiology 1 Nervous System Organization and Function 1. Central Nervous System (CNS) : brain and spinal cord 2. Peripheral Nervous System (PNS) : ganglia and peripheral nerves (cranial and spinal) outside the CNS Separate anatomically – interconnected and interactive functionally A. collections of neurons in the CNS are nuclei collections of neurons in the PNS are ganglia B. groups of axons in the CNS are tracts groups of axons in the PNS are nerves Organization A. Peripheral Nervous System (PNS) : ganglia and peripheral nerves outside the CNS 1. Somatic a. spinal nerves b. cranial nerves c. sensory system sensory receptors d. motor system effectors e. processing of information through sensory axis and motor axis 2. Autonomic a. sympathetic – response to stress Acetylcholine (ACh): pre-ganglionic neurons; Norepinephrine (NE): post-ganglionic neurons b. parasympathetic – conserve body’s resources and restore homeostasis Acetylcholine (ACh): pre- and post-ganglionic neurons c. enteric – controls smooth muscles of gut B. Central Nervous System (CNS) : spinal cord and brain Protective elements: 1. meninges 2. bone 3. CSF 4. BBB 7 anatomical regions (including spinal cord) (all bilaterally paired) Spinal Cord Base of skull to L1 – length 45 cm (male) 43 cm (female); length of vertebral column 70 cm
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