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

(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.