from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The sheath that is formed by a Schwann cell.
from The Century Dictionary.
- noun The delicate structureless sheath of a nerve-fiber; the primitive sheath; the sheath of Schwann.
- noun The sheath of a nerve-funieulus; the perineurium.
- noun Of the spinal cord, the pia mater.
from the GNU version of the Collaborative International Dictionary of English.
- noun The delicate outer sheath of a nerve fiber; the primitive sheath.
- noun The perineurium.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun The outer
membranouscovering of a nervefiber.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun thin membranous sheath around a nerve fiber
from The American Heritage® Dictionary of the English Language, 4th Edition
The Schwann's cells finally form a thin membrane called the neurilemma (nyoo'rih-lem'uh; "nerve-skin" G), which still contains the nuclei of the original Schwann's cells.
Where the neurilemma has been destroyed or where the axon is one lacking a neurilemma (as many are) regeneration is impossible.
An axon which has degenerated through injury or disease can sometimes be regenerated, provided its neurilemma has remained intact.
Surrounding the axis cylinder is a thick, whitish-looking layer, known as the _medullary sheath_, and around this is a thin covering, called the _primitive sheath_, or neurilemma.
A, a medullated nerve fiber, showing the subdivision of the medullary sheath into cylindrical sections imbricated with their ends, a nerve corpuscle with an oval nucleus is seen between the neurilemma and the medullary sheath;
The whole is enclosed in a thin, delicate sheath, known as neurilemma.
Around this bundle of neurones, that is around the nerve, is still another wrapping, silvery-white, called the neurilemma.
A nerve consists of a bundle of tubular fibers, held together by a dense areolar tissue, and inclosed in a membranous sheath -- the neurilemma.
All the larger nerve-fibers lie side by side in the nerve-trunks, and are bound together by delicate connective tissue, enclosed in a sheath of the same material, termed the _neurilemma_.
(It was Schwann who first described the neurilemma in 1839, so that it is sometimes called the "sheath of Schwann."