1 / 16

Electrical Signals within the Nervous System ( lec 2)

Electrical Signals within the Nervous System ( lec 2). Electrical Signals within the NS. 1-Action potential 2-Electrotonic(graded) potential. Fig. 12.13. Myelination increase membrane resistance & decrease membrane capacitance . . Classification for Peripheral Fibers.

kiet
Télécharger la présentation

Electrical Signals within the Nervous System ( lec 2)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Electrical Signals within the Nervous System (lec 2)

  2. Electrical Signals within the NS 1-Action potential 2-Electrotonic(graded) potential

  3. Fig. 12.13

  4. Myelination increase membrane resistance & decrease membrane capacitance.

  5. Classification for Peripheral Fibers Fiber size: I, II, III, IV Conduction velocity: A, B, C Major afferent Major efferent Nolte 9-21

  6. Susceptibility of Different Types of Fibers toConduction Block by Various Agents

  7. Absolute & Relative Refractory Period

  8. Refractory period

  9. Action potential • Regenerative, • Threshold • Move along axon • Voltage gated channels • Propagates • All or None • Amplitude above 100 mv • Short duration • Depolarizing then repolarizing • Refractory period • No summation. • Function: carries information faithfully unchanged from one end of neuron to other, without decrement.

  10. Convulsion/Fit/Seizure

  11. Effect of ionic composition on nerve fiber excitability: Hypercalcaemia & Hypokalemia Decrease n.f. excitability. Hypocalcaemia increase n.f. excitability

More Related