What is the function of neurilemma cell?

Neurilemma serves a protective function for peripheral nerve fibers. Damaged nerve fibers may regenerate if the cell body is not damaged and the neurilemma remains intact. The neurilemma forms a regeneration tube through which the growing axon re-establishes its original connection.

What is the neurilemma sheath?

Medical Definition of neurilemma : the outer layer surrounding a Schwann cell of a myelinated axon. — called also nerve sheath, Schwann’s sheath, sheath of Schwann.

How do Schwann cells form the myelin sheath and the neurilemma?

The Schwann cells repeatedly wrap themselves around the axon, forming layers of membrane called the myelin sheath. This structure pushes the Schwann cell’s cytoplasm and organelles to the periphery of the cell, which is called the neurilemma.

Do Schwann cells make neurilemma?

Schwann cells They may form a thick sheath of myelin or create indented plasma membrane folds around peripheral axons throughout the PNS. Where a Schwann cell covers an axon, the outer Schwann cell surface is known as the neurilemma. This shields the axon from interstitial fluids.

What is the difference between neurilemma and myelin sheath?

Neurilemma and myelin sheath are two layers that surround the myelinated nerve fibers. The main difference between neurilemma and myelin sheath is that neurilemma is the plasma membrane layer of the Schwann cells whereas myelin sheath is the fatty acid layer that encloses the nerve fiber.

Why neurilemma is absent in CNS?

Neurilemma is the plasma membrane of Schwann cells that surrounds the myelinated nerve fibers of peripheral nervous system and is absent in the central nervous system due to the lack of myelin sheath due to absence of Schwann cells.

What is the difference between myelin sheath and neurilemma?

What cells form the myelin sheath?

Schwann cells make myelin in the peripheral nervous system (PNS: nerves) and oligodendrocytes in the central nervous system (CNS: brain and spinal cord). In the PNS, one Schwann cell forms a single myelin sheath (Figure 1A).