Question

Which of the following is true about neurolemma?

• A. The cell membrane around the nerve cell
• B. A layer of fatty substance around axon
• C. A layer of specialised neuroglia around myelin sheath of nerve fibres
• D. The connective tissue around a nerve tract

Answer 1

The correct option is C

A layer of specialised neuroglia around myelin sheath of nerve fibres

The correct option is C.

Explanation of correct option :

1. Neuron axons are enveloped by a white insulating coating called the myelin sheath, which is then covered by a thin outer sheath called neurolemma.
2. Neurilemma protects nerve fibers in the peripheral nervous system.
3. If the cell body is not injured and the neurilemma is intact, damaged nerve fibers can recover.

Explanation of incorrect options:

Option A:

1. Myelin is a lipid-rich material that insulates nerve cell axons and speeds up the passage of electrical impulses (called action potentials).

Option B:

1. A fatty material makes up the myelin that surrounds the axon.

Option D:

1. The epineurium is the outermost layer of dense, uneven connective tissue that surrounds a peripheral nerve.

Final answer: Neurilemma is a layer of specialized neuroglia around the myelin sheath of nerve fibers.