Why are medullated nerves fibres more efficient than non-medullated nerve fibres ?

Explanation

Medullated nerve fibres are those axons which have a covering of fat rich medullary sheath below the neurilemma (Fig .3.35) . During impulse conduction , they are more efficient than non-medullated nerve fibres nerve fibres due to following two medullated nerve fibres being well insulated do not meet any interference in impulse conduction . (ii) An impulse does not travel all along the axon but jumps from one node of Ranvier to the next. By this saltation (jumping process) medullated nerve efficient in impulse transmission as compared to non-medullated nerve fibres.