Question

Name the area where the medullary sheath is absent in a nerve fibre

(pls don't put useless answers)

Answer 1

Answer:

The region where axon is not covered by the myelin sheath is the junction of the adjacent myelinated segments called 'Node of Ranvier'. The myelin sheath is formed by Schwann cells and each Schwann cell covers a part of the axon.

The cell body contains a large spherical nucleus along with a large number of Nissl's granules within the cytoplasmic matrix.

Answer 2

Answer:

nodes of ranvier

Explanation:

myelin sheath isolates the axon from the surrounding compartments. It reduces the current flow across the axonal membrane allowing a saltatory conduction along the nerve fibre from one to the next area lacking a myelin sheath at the sites of the cell borders, called the nodes of Ranvier