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The formation of myelin sheath around the axon is called the myelinogenesis. In the peripheral nerve, the myelinogenesis starts at 4th month of intrauterine life. It is completed only in the second year after birth. Before myelinogeneis, Schwann cells of the neurilemma are very close to axolemma as in the case of unmyelinated nerve fiber. The membrane of the schwann cell is double layered. The schwann cells wrap up and rotate around the axis cylinder in many concentric layers. The concentric layers fuse to produce the myelin sheath but the cytoplasm of the cells is not deposited. Outermost membrane of Schwann cell remains as neurilemma. Nucleus of these cells remains in between myelin sheath and neurilemma. In the central nervous system, the schwann cells are absent and the myelin sheath is formed by the neuroglial cells called the oligodendroglia.

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What is the definition of myelin sheath?

A myelin sheath is a layer of myelin (a dielectric, or electric insulator) around the axon of a neuron.


What would happen if the neuron did not have a myelin sheath?

if neurons didn't have myelin sheath then the transmission of nerve impulses is slowed or stopped


In a neuron the myelin sheath serves to insulate?

This insulation acts to increase the rate of transmission of signals. The Myelin Sheath of a neuron consists of fat-containing cells that insulate the axon from electrical activity.


Which structure if the neuron transmits an impulse through the myelin sheath?

Neural impulses (action potentials) are transmitted through axons which are covered in a myelin sheath for insulation.


What part of a neuron is often encased by a fatty myelin sheath?

It is located on the axon


What keeps the neuron in working order and has specialized extensions that arise from it?

Myelin sheath


It insulates the axon of the neuron?

The myelin sheath insulates the axon of a neuron, allowing for faster transmission of electrical signals. This fatty layer helps to speed up the signal conduction by allowing the electrical impulse to jump from one node of Ranvier to the next, a process known as saltatory conduction.


What does the sheath do in the nerve cell?

The myelin sheath acts as a covering on the axon of a neuron just as the covering on the cord you plug into an electrical socket. If it is damaged, the current can be "short circuited" and the neuron and the axon will not function. This sheath allows impulses to travel rapidly. MS is a disease where these sheaths are damaged.


What part of the neuron keeps the nerve healthy and protects them at the same time?

Myelin Sheath


Imagine two neurons one is wrapped with a myelin sheath and has a large diameter the second neuron has no myelin sheath and a narrow diameter which of these neurons conducts a nerve impulse more rap?

Neurons send their impulses up and down the spinal cord. The myelin sheath is the coating around the spinal cord that protects it, and works to better conduct the signals along the cord. A neuron that has no myelin sheath will have a harder time conducting signals than one that is covered by the sheath.


Impulses are conducted rapidly if is present?

Myelin sheath. It is a fatty layer that surrounds the axon of a neuron and helps to speed up the transmission of electrical impulses along the neuron.


What does myelin sheath wrap around?

The myelin sheath wraps around the axons of neurons in the nervous system. This fatty layer helps to insulate and protect the axon, allowing for faster transmission of electrical signals along the neuron.