Delicate membrane that surrounds the axon of some nerve cells is called

Delicate membrane that surrounds the axon of some nerve cells is called

• A. Neurilemma
• B. Myelin sheath
• C. Endoneurium
• D. Perineurium

Answer: (A)

The delicate membrane surrounding the axon in peripheral nerves is the neurilemma. It is the thin layer formed by the Schwann cell’s plasma membrane and cytoplasm that wraps around individual axons. This outer sheath is what remains around regenerating axons and helps support repair in the peripheral nervous system. The myelin sheath, while related, is a thicker insulating layer created by Schwann cells around segments of the axon to speed up electrical conduction. Endoneurium and perineurium are connective tissue coverings surrounding nerve fibers and bundles, not the delicate axonal membrane.

The delicate membrane surrounding the axon in peripheral nerves is the neurilemma. It is the thin layer formed by the Schwann cell’s plasma membrane and cytoplasm that wraps around individual axons. This outer sheath is what remains around regenerating axons and helps support repair in the peripheral nervous system. The myelin sheath, while related, is a thicker insulating layer created by Schwann cells around segments of the axon to speed up electrical conduction. Endoneurium and perineurium are connective tissue coverings surrounding nerve fibers and bundles, not the delicate axonal membrane.