perineurium


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perineurium

 [per″ĭ-noor´e-um]
the connective tissue sheath surrounding each bundle of nerve fibers (fascicle) in a peripheral nerve. adj., adj perineu´rial.

per·i·neu·ri·um

, pl.

per·i·neu·ri·a

(per'i-nū'rē-ŭm, -rē-ă),
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 nerve; with the endoneurium and epineurium, composes the peripheral nerve stroma.
[L. fr. peri- + G. neuron, nerve]

perineurium

/peri·neu·ri·um/ (-noor´e-um) an intermediate layer of connective tissue in a peripheral nerve, surrounding each bundle of nerve fibers.perineu´rial

perineurium

(pĕr′ə-no͝or′ē-əm, -nyo͝or′-)
n. pl. peri·neuria (-no͝or′ē-ə, -nyo͝or′-)
The sheath of connective tissue enclosing a bundle of nerve fibers.

per′i·neu′ri·al adj.

per·i·neu·ri·um

, pl. perineuria (per'i-nūr'ē-ŭm, -ă) [TA]
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 nerve; with the endoneurium and epineurium, composes the peripheral nerve stroma.
[L. fr. peri- + G. neuron, nerve]

perineurium

A sheath of connective tissue surrounding and separating nerve fibre bundles.

perineurium

the connective tissue sheath surrounding each bundle (fascicle) of nerve fibers in a peripheral nerve.
References in periodicals archive ?
Lundborg G, Rydevik B: Effects of stretching the tibial nerve of the rabbit: A preliminary study of the intraneural circulation and the barrier function of the perineurium.
In this series, some biopsies contained relatively few hyphae that stained poorly; the pale hyphae were difficult to identify in the normally eosinophilic background of the perineurium.
Nerve vascularization is provided by a network of small, interconnected blood vessels running longitudinally inside the epineurium and the perineurium.
Neurotmesis is the interruption of neurites, myelin, and the nerve envelopes (at least the endoneurium and the perineurium, in crush injury, for example).
Neurotmesis is the interruption of the fibers' envelopes, even with immediate termino-terminal anastomosis and even if just the endoneurium and perineurium are interrupted without epineural effraction.
As GLUT-1 antibodies enable the perineurium to be identified in both large and small nerve fibers, we studied material from healthy and HD tissues to assess the distribution of perineurial-bound nerve fibers and to determine if their demonstration has diagnostic usefulness.
Glucose transporter-1 strongly stained the perineurium but did not stain the nerve fibers within the perineurium, thus giving a ringlike staining pattern (Figures 1 through 5).
The perineurium of serosal (or extramural) nerves stained in all cases of resected HD (Figure 1, A) and healthy control (autopsy) colon.
Frequent smaller nerve fibers also stained in these zones, and in some of these fibers a distinct perineurium could be detected focally when a space existed between nerve and perineurium.
In healthy control bowel and in ganglionic HD (Figure 1), the large extrinsic nerves of the serosa stained both for GLUT-1 (ringlike pattern) and NGFR (both perineurium and nerve stained).
11] Immunohistochemical demonstration of NGFR staining of the perineurium of both hypertrophic and extrinsic fibers provides additional evidence.