perineurium
noun
peri·neu·ri·um
ˌper-ə-ˈnu̇r-ē-əm
-ˈnyu̇r-
plural perineuria
ˌper-ə-ˈnu̇r-ē-ə
-ˈnyu̇r-
: the connective-tissue sheath that surrounds a bundle of nerve fibers
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Merriam-Webster unabridged
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