Question

Which of the following conducts the slowest action potentials?

Group of answer choices

ANS post-ganlionic axons

ANS pre-ganglionic axons

SNS lower motor neurons

Answer 1

The conduction velocity primarily depends on the myelination. Based on myelination, there are three types of nerve fibres:-

A maximum myelination. Divided into A alpha, A beta, A gamma, A delta. The conduction velocity decreases as moves down.

B myelinated.

C unmyelinated. SLOWEST conduction velocity.

ANS post ganglionic neurons are C fibres (unmyelinated) . Therefore these have SLOWEST CONDUCTION VELOCITY.

ANS preganglionic neurons are B fibres (myelinated). They have fast conduction velocity but not as fast as A fibres.

Somatic nervous system lower motor neurons. These have A alpha (fastest), A gamma (fast) fibres.