Some nerve cells are unmyelinated, specially from autonomic nervous system. Why it is so, is not clear to the contributor. Expert comment is needed on this topic.
Myelin Sheath
Myelin Sheath
The myelin sheath forms a protective layer over nerves. However, it is not present on all nerves. Retinal nerves for instance normally are devoid of myelin.
Protects the axon. The "Myelin Sheath" serves as an insulator to protect nerves.
The myelin sheath surrounding nerves.
The spinal cord and all nerves are composed of nervous tissue. The myelin sheath conducts nerve impulses.
Schwann cells produce myelin in peripheral nerves. Schwann cells wrap around the axon of a neuron to form the myelin sheath, which helps to insulate and speed up the conduction of nerve impulses.
Myelin Sheath Myelin Sheath
Myelin Sheath Myelin Sheath
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The endoneurium surrounds and protects the myelin sheath.
A myelin sheath is a layer of myelin (a dielectric, or electric insulator) around the axon of a neuron.