||Medullated nerve fibre
||Non-medullated nerve fibre
||It is also known as myelinated nerve fibre.
||It is also known non-myelinated nerve fibre.
||The nerve fibre with medullary sheath is called medullated fibre.
||The nerve fibre without medullary sheath is called non-medullated nerve fibre.
||It is found in white matter of brain and spinal cord.
||It is found in grey matter of brain and spinal cord and in autonomous nervous system.
||Nodes of Ranvier present.
||Nodes of Ranvier absent.
||It is white in colour.
||It is grey in colour.
||Conduction of nerve impulse is faster.
||Conduction of nerve impulse is slower.
||It has more diameter.
||It has less diameter.
||Collateral nerve fibres are present.
||Collateral nerve fibres are absent.
||More common in veretbrates.
||Almost all the invertebrates and some vertebrates have non-myelinated nerve fibre.
||Schwann cell secretions lead to myelin formation.
||Schwann cells do not show any secretory function.
Differences between Medullated and Non-medullated nerve fibre