Continuous conduction is the second way of nerve impulse transmission. It occurs in unmyelinated axons. Action potential is generated along the entire length of the axon. Hence, it takes time to generate and transmit action potential.

Where does saltatory conduction take place?

Saltatory conduction occurs widely in the myelinated nerve fibers of vertebrates, but was later discovered in a pair of medial myelinated giant fibers of Fenneropenaeus chinensis and Marsupenaeus japonicus shrimp, as well as in a median giant fiber of an earthworm.

Where does depolarization occur in continuous conduction?

During conduction of an action potential, the passive spread of depolarization to the adjacent distal region of membrane slightly depolarizes the new region, causing opening of a few voltage-gated Na⁺ channels and an increase in Na⁺ influx.