Which of the Following Types of Nerve Fiber Possesses the Fastest

Question

Which of the following types of nerve fiber possesses the fastest speed of impulse propagation?
A) type A
B) type B
C) type C
D) type D
E) type E

Accepted Answer

Type A nerve fibers are myelinated and have the largest diameter, which allows for faster impulse propagation. They are further classified into subtypes Aα, Aβ, Aγ, and Aδ, with Aα having the fastest speed of propagation. Type B fibers are myelinated but smaller in diameter, while Type C fibers are unmyelinated and have the slowest speed of propagation. Type D and E fibers do not exist in the classification system for nerve fibers.