Anatomy and Physiology Part II - PowerPoint PPT Presentation

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Anatomy and Physiology Part II

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  1. Anatomy and Physiology Part II

  2. Nerve Anatomy

  3. Axon • Like a tube • negative on the inside _ +

  4. Myelin • Insulates like on a wire • Made by Schawann cells

  5. Dendrites • Communicate with other cells • Release neurotransmitters • Don’t quite touch!

  6. Nerve Physiology

  7. Na+ K+ Na+ Na+ K+ K+ Na+ K+ K+ K+ K+ Na+ K+ K+ Na+ K+ K+ K+ Na+ Na+ Na+ K+

  8. Action Potential

  9. Action Potential Afterhyperpolarization

  10. Saltatory Conduction

  11. Speed: Mylenated: 80 – 120 m/s (179 – 268 mi/hr) Unmylenated: About 1 m/s (2.2 mi/hr)

  12. Implications The Cranial Nerves (click)(click) Can be affected by massage