Nervous system

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Nervous system

  1. 1. The Anatomy and Physiology ofThe NervousSystemDr Ashwini Kalantri
  2. 2. OrgansCNS: Brain Spinal CordPNS: Nerves
  3. 3. Brain It is one of the largest organs in the body, and coordinates most body activities. It is the center for all thought, memory, judgment, and emotion. Each part of the brain is responsible for controlling different body functions, such as temperature regulation and breathing.
  4. 4. Cerebrum It is the largest section of the brain It is located in the upper portion of the brain and is the area that processes thoughts, judgment, memory, problem solving, and language. The outer layer of the cerebrum is the cerebral cortex, which is composed of folds of gray matter. The cerebrum is subdivided into the left and right halves called cerebral hemispheres. Each hemisphere has 4 lobes.
  5. 5. Lobes of Cerebrum
  6. 6. Lobes of Cerebrum 1. Frontal lobe: Most anterior portion of the cerebrum, controls motor function, personality, and speech 2. Parietal lobe: The most superior portion of the cerebrum, receives and interprets nerve impulses from sensory receptors and interprets language. 3. Occipital lobe: The most posterior portion of the cerebrum, controls vision. 4. Temporal lobe: The left and right lateral portion of the cerebrum, controls hearing and smell
  7. 7. Cerebellum Second largest portion of the brain Located beneath the posterior part of the cerebrum Aids in coordinating voluntary body movements and maintaining balance and equilibrium Refines the muscular movement that is initiated in the cerebrum
  8. 8. Brain Stem Midbrain—acts as a pathway for impulses to be conducted between the brain and the spinal cord. Pons — means bridge—connects the cerebellum to the rest of the brain. Medulla oblongata—most inferior positioned portion of the brain; it connects the brain to the spinal cord.
  9. 9. Spinal Cord Runs through the vertebral canal Extends from foramen magnum to 2nd lumbar vertebra Regions  Cervical  Thoracic  Lumbar  Sacral  Coccygeal Gives rise to 31 pairs of spinal nerves - all are mixed nerves
  10. 10. Meninges Dura mater: outermost layer; continuous with epineurium of the spinal nerves Arachnoid mater: thin and wispy Pia mater: bound tightly to surface
  11. 11. Nerves
  12. 12. Nerves
  13. 13. Neuron
  14. 14. Synapse

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