1. Saltatory Conduction

6. Voltage drop without myelin
DVx = DVoe-x/l
The length constant, l, is the distance over which the potential falls by 1-1/e a reduction of 63% of the original PD at the point where current was injected.
Length constants range from .1 mm for a small axon with a low resistance membrane to 5 mm for a large axon with a high resistance membrane.
Size, and high resistance increase the length constant and current spread.

11. Spinal Cord and CNS Injury
Problems
Cell Death and Secondary death
Disruption of Nerve pathways
Demyelination

12. Therapies Neuroprotection Growth Factors, Vitamin C,
Temperature Change
Replacement of Nerve Cells
Transplant of Fetal Tissue
Native Stem Cells

13. Regenerationn of Damaged Axons
Schwann cell transplant
Use of olfactory cells
Remyelination of Axons

14. Post Synaptic Potential
Post Synaptic Potentials are Gradeed

18. Post Synaptic Potentials can be summed temporally and spatially