Question

Differentiate between Medullated and non-medullated nerve fibre.

Answer 1

Medullated nerve fibre	Non-medullated nerve fibre
1. Nerve fibre is covered by a protective sheath, called the Myelin sheath, which is covered by Neurilemma.	1. Nerve fibre is covered by a single sheath, Neurilemma.
2. Nodes of Ranvier are present.	2. Nodes of Ranvier are absent.
3. They appear white.	3. They appear grey.
4. They carry nerve impulses, much faster than non-medullated nerve fibre.	4. They carry nerve impulses, much slower than medullated nerve fibre.
5. They are present in the white matter of the brain, spinal cord and in cranial and spinal nerves.	5. They are present in the grey matter of the brain and spinal cord and in the autonomic nerves.