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

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

per′i·neu′ri·al adj.
References in periodicals archive ?
10) Tourniquet application has been implicated; animal studies demonstrate perineurial edema after 2 to 4 hours of compression and irreversible loss of nerve function after 6 to 8 hours.
Neurofibromas are composed of a proliferation of all elements of a peripheral nerve, including Schwann cells, axons, perineurial cells, and fibroblasts.
2', 3'-Cyclic nucleotide 3'-phosphodiesterase cells derived from transplanted marrow stromal cells and host tissue contribute to perineurial compartment formation in injured rat spinal cord.
Malignant peripheral nerve sheath tumor (MPNST) showing perineurial cell differentiation.
Perineurial repair involves repairing the individual fascicles and placing sutures through the perineurium.
However, their study included ultrastructural and immunohistochemical analyses, and they found these tumors had features of perineurial cells, so they designated these lesions intestinal perineuriomas.
Groups of nerve fibers form fascicles, which are then surrounded by a perineurial sheath.
The fascicle is the smallest unit of the nerve visible using the operating microscope, and perineurial sutures are possible.
It consists of neoplastic perineurial cells similarly disposed around nerve fibers.
14-16) These lesions are also positive for other perineurial markers including claudin-1, GLUT1, and collagen type IV.
Also eliminated from the study were all cases coded in our database as "nerve" in which there was microscopic malignant perineurial invasion of a small peripheral nerve branch within a large resection specimen.
169) Necrosis, mitotic activity, perineurial invasion, and invasion to adjacent pancreas have all failed to prove any correlation with metastatic behavior.