Perineurium

Perineurium

Infobox Anatomy
Name = PAGENAME
Latin =
GraySubject = 183
GrayPage = 728


Caption = Transverse section of human tibial nerve. (Perineurium labeled at upper right.)


Caption2 = Nerve structure
System =
MeshName = Perineurium
MeshNumber = A08.800.800
DorlandsPre = p_13
DorlandsSuf = 12627709
In the spinal cord, nerve fibers are each wrapped in a protective sheath known as the endoneurium. These are bundled together into groups known as fascicles, each surrounded by a protective sheath known as the perineurium. Several fascicles may be in turn bundled together with a blood supply and fatty tissue within yet another sheath, the epineurium. This grouping structure is analogous to the muscular organization system of epimysium, perimysium and endomysium.

The perineurium is composed of connective tissue, which has a distinctly lamellar arrangement consisting of roughly 7-8 concentric layers. The perineurium is cellular, and is composed of perineurial cells, which are epithelioid myofibroblasts. Perineurial cells are sometimes referred to as myoepithelioid due to their epithelioid and myofibroblastoid properties including tight junctions, gap junctions, external laminae and contractility.

The perineurium is a smooth, transparent tubular membrane which may be easily separated from the fibers it encloses. In contrast, the epineurium is a tough and mechanically resistant tissue which is not easily penetrated by a needle.

External links

*
* - "Peripheral nerve"
* - "PNS, nerve (LM, Low)"
*
* [http://www.med.howard.edu/anatomy/gas/wk2/images/image2.gifDiagram at Howard]
* [http://neuromedia.neurobio.ucla.edu/campbell/nervous/wp_images/182%20endoneurium%20LP.jpgHistology at ucla.edu]


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  • perineurium — PERINEÚRIUM s.n. (anat.) Teaca de ţesut conjunctiv a unui fascicul de fibre nervoase. [cf. fr. périneurium]. Trimis de LauraGellner, 20.07.2005. Sursa: DN …   Dicționar Român

  • Perineurium — Per i*neu ri*um, n. [NL., fr. Gr. ? about + ? a nerve.] (Anat.) The connective tissue sheath which surrounds a bundle of nerve fibers. See {Epineurium}, and {Neurilemma}. [1913 Webster] …   The Collaborative International Dictionary of English

  • Perineurĭum — (griech.), die Bindegewebshülle, welche die einzelnen Nervenfasern und den ganzen Nerv umgibt; s. Tafel »Gewebe des Menschen«, Fig. 5 …   Meyers Großes Konversations-Lexikon

  • Perineurium — Perineurĭum (grch.), die Bindegewebshülle, die die einzelnen Nervenfasern, und den ganzen Nerven umgibt …   Kleines Konversations-Lexikon

  • perineurium — [per΄ə noor′ē əm, per΄ənyoor′ē əm] n. pl. perineuria [per΄i noor′ēə, per΄i nyoor′ēə] [ModL < PERI + Gr neuron,NERVE] the sheath of dense connective tissue that envelops a bundle of nerve fibers composing a peripheral nerve perineurial adj …   English World dictionary

  • Perineurium — Als Nervenfaser bezeichnet man den Fortsatz einer Nervenzelle, das Axon bzw. den Neuriten mitsamt seiner Myelinscheide. Diese Nervenfasern sind im peripherem Nervensystem durch bindegewebige Hüllen zu Nerven gebündelt. Inhaltsverzeichnis 1… …   Deutsch Wikipedia

  • perineurium — One of the supporting structures of peripheral nerve trunks, consisting of layers of flattened cells and collagenous connective tissue, which surround the nerve fasciculi and form the major diffusion barrier within the …   Medical dictionary

  • Perineurium — nervinių skaidulų pluoštą supantis dangalas statusas T sritis histologija, ląstelių chemija, histologinė chemija, audinių kultūra atitikmenys: lot. Perineurium ryšiai: platesnis terminas – nervas siauresnis terminas – epiteliškoji dalis… …   Veterinarinės anatomijos, histologijos ir embriologijos terminai

  • Perineurium — nervinių skaidulų pluoštą supantis dangalas statusas T sritis histologija atitikmenys: lot. Perineurium ryšiai: platesnis terminas – periferinė nervų sistema siauresnis terminas – epitelinė dalis siauresnis terminas – skaidulinė dalis sinonimas – …   Medicininės histologijos ir embriologijos vardynas

  • perineurium — noun (plural perineuria) Etymology: New Latin, from peri + Greek neuron nerve more at nerve Date: circa 1842 the connective tissue sheath that surrounds a bundle of nerve fibers …   New Collegiate Dictionary

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