Question

different between medullated and non medullated fibre​

Answer 1

Answer:

Non-medullated nerve fibre is a nerve fibre without medullary sheath. Medullated nerve fibre is also referred to as myelinated nerve fibre. Non-medullated nerve fibre is also referred to non-myelinated nerve fibre. Medullated nerve fibre is found in the white matter of the brain and spinal cord

Explanation:

Answer 2

Answer:

DON'T FORGET TO LIKE IT

Explanation:

Medullated (Myelinated) nerve fiber Non-medullated (Non-myelinated) nerve fiber

medulated

1. It comprises of neuraxis, which is covered by two sheaths;

i) inner thick myelin sheath of fatty material called myelin

ii) outer thin neurilemma

nonmedulated

It comprises of neuraxis which is covered by a single sheath, the neurilemma. Myelin sheath is absent.

2. MEDULATED They appear white in fresh state.

NONMEDULATED They appear grey in fresh state.

3.MEDULATED Nodes of Ranvier are present in. NONMEDULATED Nodes of Ranvier are absent.

4. MEDULATED

Extracellular fluid is in contact with the axon only at the nodes.

NONMEDULATED Extracellular fluid is in contact with the axon along its entire length.

MEDULATED Voltage-gated ion channels are concentrated at the nodes.

NONMEDULATED Voltage-gated ion channels are spread all over the axon.

6. MEDULATED

Ion exchange can occur only at the nodes. NONMEDULAYED

Ion exchange occurs all along the axon.

MEDULATED

Action potential doesn’t propagate over the internodes, and jumps from node to node.

NONMEDULATED

Action potential propagates all along the axon.

8. MEDULATED

Nerve impulse conduction is salutatory. NONMEDULATED

Nerve impulse conduction is smooth.

9. MEDULATED

These carry nerve impulses much faster than non-medullated nerve NONMEDULATED

These carry nerve impulses much slower than the medullated nerve fiber

.

10. MEDULATED

These are present in the white matter of brain and spinal cord and in the cranial and spinal nerves. NONMEDULATED.

These are present in the grey matter of brain and spinal cord and in the autonomic nerves.

11. MEDULATED.

Collateral nerve fibers are present

NONMED.

Collateral nerve fibers are absent.

12. MEDULATED

They are more common in vertebrates.

NONMEDULATED

They are found in few vertebrates and almost all the invertebrates.