Question

Most of the axons of a humans motor neurons are covered by an insulating substance called

Answer 1

Myelin or medullary sheath. This is an insulating sheath which prevents mixing of nerve impulses of the adjacent nerve fibres.

Answer 2

Answer:

The axons of the human motor nerves are covered by an insulating layer called a myelin sheath.

Explanation:

The axons of the human motor nerves are covered with an insulating layer known as Myelin Sheath. This sheath protects the nerves from electrical impulse but except the gaps which is known as Nodes of Ranvier.

The myelin sheath is having a nucleus known as "Schwann cells". The action potentials of the insulated axons get increases and there is a build-up higher abundance of ion channels. The action potentials generates by saltation process.