neurilemma

1. Any of the cells having a membrane that composes a sheath around the axons of peripheral nerves. Also called Schwann cell.
2. The sheath formed by such a cell.

[Alteration (influenced by Greek lemma, husk) of French névrilème : névr-, nerve (from Greek neuro-, neuro-) + Greek eilēma, veil (from eilein, to wind, turn).]

The thin membranous outer covering surrounding the myelin sheath of a medullated nerve fiber or the axis cylinder of a nonmedullated nerve fiber. Neurilemma is associated with the booster mechanisms for the rapid transmission of impulses. Also called sheath of Schwann.

The plasma membrane of a Schwann cell, forming the sheath of Schwann of a myelinated or unmyelinated peripheral nerve.

Neurolemma
Diagram of longitudinal sections of medullated nerve fibers.
Transverse sections of medullated nerve fibers.
Gray's	subject #183 727
MeSH	A08.561.600
Dorlands/Elsevier	Neurilemma

Neurolemma (also known as neurilemma^[1] or sheath of Schwann) is the outermost nucleated cytoplasmic layer of Schwann cells 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 CNS, axons are myelinated by oligodendrocytes, thus lack neurolemma.

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

References

1. ^ neurilemma at Dorland's Medical Dictionary
2. ^ Elaine N. Marieb and Katja Hoehn (2007). Human Anatomy & Physiology (7th Ed.). Pearson. pp. 394–5. ISBN 0-805-35909-5. 
3. ^ neurilemoma at Dorland's Medical Dictionary

External links

• Histology at dmacc.edu

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v • d • e Histology: nervous tissue Neurons (gray matter) soma · axon (axon hillock, axon terminals, axoplasm, axolemma, neurofibril/neurofilament) dendrite (Nissl body, dendritic spine, apical dendrite, basal dendrite) types: bipolar · pseudounipolar · multipolar · pyramidal · Purkinje · granule Afferent nerve/ Sensory nerve/ Sensory neuron GSA · GVA · SSA · SVA · fibers (Ia, Ib or Golgi, II or Aβ, III or Aδ or fast pain, IV or C or slow pain) Efferent nerve/ Motor nerve/ Motor neuron GSE · GVE · SVE · Upper motor neuron · Lower motor neuron (α motorneuron, γ motorneuron) Synapses neuropil · synaptic vesicle · neuromuscular junction · electrical synapse · Interneuron (Renshaw) Sensory receptors Meissner's corpuscle · Merkel nerve ending · Pacinian corpuscle · Ruffini ending · Muscle spindle · Free nerve ending · Olfactory receptor neuron · Photoreceptor cell · Hair cell · Taste bud Glial cells Astrocyte (Radial glia) · Oligodendrocyte · Ependymal cells (Tanycytes) · Microglia Myelination (white matter) CNS: Oligodendrocyte PNS: Schwann cell · Neurolemma · Nodes of Ranvier/Internode · Schmidt-Lanterman incisures Related connective tissues epineurium · perineurium · endoneurium · nerve fascicle · meninges

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