Neurolemma

Neurolemma
Diagram of longitudinal sections of medullated nerve fibers.
Transverse sections of medullated nerve fibers.
Identifiers
MeSH	Neurilemma
Code	TH H2.00.06.1.00002
Anatomical terminology [edit on Wikidata]

Neurolemma (also known as neurilemma^[1] or sheath of Schwann (Schwann's Sheath)) is the outermost nucleated cytoplasmic layer of Schwann cells (also called neurolemmocytes) that surrounds the axon of the neuron. It forms the outermost layer of the nerve fiber in the peripheral nervous system.^[2]

The neurolemma is underlain by the basal lamina (referred to as the medullary sheath in the included illustrations). In the CNS, axons are myelinated by oligodendrocytes, thus lack neurolemma. The myelin sheaths of Oligodendrocytes do not have neurolemma because excess cytoplasm is directed centrally toward the Oligodendrocyte cell body.

Neurolemma serves a protective function for peripheral nerve fibers. Damaged nerve fibers may regenerate if the perikaryon is not damaged and the neurolemma remains intact. The neurolemma forms a regeneration tube through which the growing axon reestablishes its original connection.

A neurilemoma is a tumor of the neurilemma.^[3]

References

1. "neurilemma" at Dorland's Medical Dictionary
2. Elaine N. Marieb; Katja Hoehn (2007). Human Anatomy & Physiology (7th Ed.). Pearson. pp. 394–5. ISBN 0-8053-5909-5.
3. "neurilemoma" at Dorland's Medical Dictionary

External links

• Histology at dmacc.edu