Question

Myelin sheath is made up of phospholipids and is present around the

• A. Medullated nerve fibre
• B. Non-medullated nerve fibre
  
• C. Muscle fibres
• D. Medullated and non-medullated nerve fibre

Answer 1

The correct option is A Medullated nerve fibre

Myelin sheath
The myelin sheath is an insulating layer made up of lipids and proteins, secreted by the Schwann cells in the axons of the peripheral nervous system and oligodendrocytes in the axons of the central nervous system.
The presence of this layer allows the electric impulse to travel faster in neurons.


Medullated nerve fibre
Medullated or myelinated nerve fibres are neurons that have the myelin sheath around them.
These fibres are found in the brain, spinal cord, cranial and spinal nerves.
Since they have the myelin sheath the nerve impulses travel faster.