Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The sheath of connective tissue enclosing a bundle of nerve fibers.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The sheath of connective tissue that surrounds a fascicle of nerve fibres

from the GNU version of the Collaborative International Dictionary of English

  • n. The connective tissue sheath which surrounds a bundle of nerve fibers. See epineurium, and neurilemma.

from The Century Dictionary and Cyclopedia

  • n. The membranous sheath surrounding a nerve-funiculus. Also called neurilemma.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the sheath of connective tissue that covers a bundle of nerve fibers

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

New Latin : peri- + Greek neuron, nerve; see neuron.

Examples

  • Each ganglion is invested by a smooth and firm, closely adhering, membranous envelope, consisting of dense areolar tissue; this sheath is continuous with the perineurium of the nerves, and sends numerous processes into the interior to support the bloodvessels supplying the substance of the ganglion.

    IX. Neurology. 1. Structure of the Nervous System

  • The tubular sheath of the funiculi (perineurium) is a fine, smooth, transparent membrane, which may be easily separated, in the form of a tube, from the fibers it encloses; in structure it is made up of connective tissue, which has a distinctly lamellar arrangement.

    IX. Neurology. 1. Structure of the Nervous System

  • The bloodvessels supplying a nerve end in a minute capillary plexus, the vessels composing which pierce the perineurium, and run, for the most part, parallel with the fibers; they are connected together by short, transverse vessels, forming narrow, oblong meshes, similar to the capillary system of muscle.

    IX. Neurology. 1. Structure of the Nervous System

  • It is continuous with septa which pass inward from the innermost layer of the perineurium, and shows a ground substance in which are imbedded fine bundles of fibrous connective tissue running for the most part longitudinally.

    IX. Neurology. 1. Structure of the Nervous System

  • The nerve fibres there figured are bound together by endoneurium into small ropes, the nerves, encased in perineurium.

    Text Book of Biology, Part 1: Vertebrata

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