Nerve classification.pptx

SCSCSSS

1. CLASSIFICATION OF NERVE FIBRES SLC MD RISHAM

2. Introduction Nerve fibers are classified based on their Diameter and Velocity of conduction Structure Origin Distribution Physiological Function Functional Relation to CNS Secretion of Neurotransmitter Numerical Classification

3. In 1924 Erlanger, Gasser and Bishop reported the occurrence of several peaks of voltage on the nerve fibre following an electric stimulus .

4. In 1927 they found a correlation between T he different peaks to the different conduction velocities. Conduction velocities to the diameters. T he amount of different fibres in the different nerves.

5. T he motor nerves showed all the described peaks, while in purely sensory nerves, the a peak was missing. In 1930, Erlanger and Gasser using more sensitive equipment showed that three of the described peaks of voltage (a, b, g) belonged to a group of fibres that they called A and described two other elevations designated B and C.

6. In 1943 Lloyd and Hunt used a slightly different classification based on sensory functions.

7. Evolution Nerve fibers are studied in Invertebrates as well Longfin inshore squid – Longest Axon Giant squid- Largest Axon Penaeid Shrimps- Highest conduction velocity (210m/s)

8. ERLANGER & GASSER CLASSIFICATION

9. LLOYD & HUNT CLASSFICATION

10. Applied Physiology

11. THANKS