Explain the structure of a multipolar myelinated neuron.

Explanation

Neuron consists of two important regions
(i) Cyton (ii) Axon.
(i) Cyton : It is the cell body which is spherical or oval in shape . It contains a nucleus at the center and surrounded by cytoplasm . Cytoplasm is called Neuroplasm which contains minute fibers in a network and also special bodies called Nissl granules. These granules are believed to take part in protein synthesis . Periphery of the cyton produces branched processes . These short branches of cyton are called dendrites . One of these branches is much elongated and is called axon.
(ii) Axon: Axon is the elongated branch originating from a region called Axon hillock . The axon gives off branches at the end, called telodendria . Usually axon is covered by a continuous sheath called myelin sheath or medullary sheath . Schwann cells are present which are called neurilemma . This layer of Schwann cells shows number of constrictions These constrictions are called Nodes of Ranvier.