The Nervous System
Role of the nervous system <ul><li>respiratory center </li></ul><ul><li>defense (ex: pain stimuli) </li></ul><ul><li>relay...
Functions of the nervous system <ul><li>receives information  </li></ul><ul><li>interprets the information </li></ul><ul><...
Nerve cell
Structure and Functions –Nerve cell <ul><li>also called neuron </li></ul><ul><li>scattered throughout the body </li></ul><...
Parts of a neuron <ul><li>dendrites </li></ul><ul><li>axon </li></ul><ul><li>nucleus </li></ul><ul><li>cytoplasm </li></ul...
Axon <ul><li>threadlike structure </li></ul><ul><li>carries impulses away from the nerve cell body </li></ul><ul><li>may h...
Dendrites <ul><li>looks like fibers branching out </li></ul><ul><li>receives impulses or stimuli </li></ul>
Afferent or Efferent? Sensory or Motor? <ul><li>Pick up information, sends it to CNS </li></ul><ul><li>From CNS, sends out...
Structure and Functions- Neuroglia <ul><li>Also called glia </li></ul><ul><li>Does not transmit impulses </li></ul><ul><li...
Kinds of Glia <ul><li>Astrocytes –pass nutrients between blood capillaries and neurons </li></ul><ul><li>Microglia – engul...
 
Central nervous system <ul><li>brain </li></ul><ul><li>spinal cord </li></ul>
Brain <ul><li>cerebrum </li></ul><ul><li>cerebellum </li></ul><ul><li>brain stem </li></ul><ul><li>diencephalon </li></ul>
Spinal Cord
Peripheral Nervous System <ul><li>cranial nerves </li></ul><ul><li>spinal nerves </li></ul><ul><li>peripheral nerves </li>...
Autonomic Nervous System <ul><li>Sympathetic  </li></ul><ul><li>Parasympathetic </li></ul>
<ul><li>(I)  O </li></ul><ul><li>(II)* O </li></ul><ul><li>(III) O </li></ul><ul><li>(IV) T </li></ul><ul><li>(V) T </li><...
<ul><ul><li>Olfactory (I) – sensory (olfactory) </li></ul></ul><ul><ul><li>Optic (II) – not a true nerve </li></ul></ul><u...
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5/10 Nervous system revised

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this will be tested on thursday

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5/10 Nervous system revised

  1. 1. The Nervous System
  2. 2. Role of the nervous system <ul><li>respiratory center </li></ul><ul><li>defense (ex: pain stimuli) </li></ul><ul><li>relay information (ex: hunger, full bladder) </li></ul>
  3. 3. Functions of the nervous system <ul><li>receives information </li></ul><ul><li>interprets the information </li></ul><ul><li>makes the body respond or react </li></ul>
  4. 4. Nerve cell
  5. 5. Structure and Functions –Nerve cell <ul><li>also called neuron </li></ul><ul><li>scattered throughout the body </li></ul><ul><li>born with all the neurons that you would need (none grows or regenerates) </li></ul>
  6. 6. Parts of a neuron <ul><li>dendrites </li></ul><ul><li>axon </li></ul><ul><li>nucleus </li></ul><ul><li>cytoplasm </li></ul><ul><li>interneurons* </li></ul><ul><li>*HW: 1) What are interneurons? </li></ul><ul><li> 2) What is a soma/perikaryon? </li></ul>
  7. 7. Axon <ul><li>threadlike structure </li></ul><ul><li>carries impulses away from the nerve cell body </li></ul><ul><li>may have a myelin sheath (myelinated) </li></ul>
  8. 8. Dendrites <ul><li>looks like fibers branching out </li></ul><ul><li>receives impulses or stimuli </li></ul>
  9. 9. Afferent or Efferent? Sensory or Motor? <ul><li>Pick up information, sends it to CNS </li></ul><ul><li>From CNS, sends out orders </li></ul>
  10. 10. Structure and Functions- Neuroglia <ul><li>Also called glia </li></ul><ul><li>Does not transmit impulses </li></ul><ul><li>For protection and nourishment </li></ul>
  11. 11. Kinds of Glia <ul><li>Astrocytes –pass nutrients between blood capillaries and neurons </li></ul><ul><li>Microglia – engulf foreign materials and bacteria </li></ul><ul><li>Oligodendroglia, Schwann cells*- insulate axons of neurons </li></ul><ul><li>*HW: Are oligodendroglia and Schwann cells the same thing? </li></ul>
  12. 13. Central nervous system <ul><li>brain </li></ul><ul><li>spinal cord </li></ul>
  13. 14. Brain <ul><li>cerebrum </li></ul><ul><li>cerebellum </li></ul><ul><li>brain stem </li></ul><ul><li>diencephalon </li></ul>
  14. 15. Spinal Cord
  15. 16. Peripheral Nervous System <ul><li>cranial nerves </li></ul><ul><li>spinal nerves </li></ul><ul><li>peripheral nerves </li></ul>
  16. 17. Autonomic Nervous System <ul><li>Sympathetic </li></ul><ul><li>Parasympathetic </li></ul>
  17. 18. <ul><li>(I) O </li></ul><ul><li>(II)* O </li></ul><ul><li>(III) O </li></ul><ul><li>(IV) T </li></ul><ul><li>(V) T </li></ul><ul><li>(VI) A </li></ul><ul><li>(VII) F </li></ul><ul><li>(VIII) A </li></ul><ul><li>(IX) G </li></ul><ul><li>(X) V </li></ul><ul><li>(XI) S </li></ul><ul><li>(XII) H </li></ul>
  18. 19. <ul><ul><li>Olfactory (I) – sensory (olfactory) </li></ul></ul><ul><ul><li>Optic (II) – not a true nerve </li></ul></ul><ul><ul><li>Oculomotor (III) – motor (extrinsic eye muscles) </li></ul></ul><ul><ul><li>Trochlear (IV) – motor (extrinsic eye muscles) </li></ul></ul><ul><ul><li>Trigeminal (V) – sensory &motor (skin of head, teeth, jaws) </li></ul></ul><ul><ul><li>Abducens (VI) – motor (extrinsic eye muscles) </li></ul></ul><ul><ul><li>Facial (VII) – sensory (taste buds) & motor (2 nd hyoid arch) </li></ul></ul><ul><ul><li>Auditory (VIII) – aka octaval; sensory (inner ear) </li></ul></ul><ul><ul><li>Glossopharyngeal (IX) – sensory (taste buds, gill pouches) & motor (3 rd hyoid arch) </li></ul></ul><ul><ul><li>Vagus (X) – sensory & motor (mouth, pharynx, viscera) </li></ul></ul><ul><ul><li>Spinal Accessory (XI) – motor (mastoids, trapezius) </li></ul></ul><ul><ul><li>Hypoglossal (XII) – motor (hyoid and tongue muscles) </li></ul></ul>

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