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]
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peri·neu·ri·um .per-ə-'n(y)u̇r-ē-əm n, pl -ria -ē-ə the sheath of connective tissue that surrounds a bundle of nerve fibers
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n.
the sheath of connective tissue that surrounds individual bundles (fascicles) of nerve fibres within a large nerve.
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peri·neu·ri·um (per″e-noorґe-əm) [peri- + Gr. neuron nerve] [TA] an intermediate layer of connective tissue in a peripheral nerve, surrounding each bundle (fasciculus) of nerve fibers. See also epineurium and endoneurium. perineurial adj
Perineurium (P) surrounding a bundle of nerve fibers in a cross-section of a peripheral nerve.
Medical dictionary. 2011.