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en·do·my·si·um -əm n, pl -sia -ə the delicate connective tissue surrounding the individual muscular fibers within the smallest bundles compare EPIMYSIUM
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n.
the fine connective tissue sheath that surrounds a single muscle fibre.
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en·do·mys·i·um (en″do-misґe-əm) [endo- + Gr. mys muscle] [TA] the sheath of delicate reticular fibrils which surrounds each muscle fiber. endomysial adjMedical dictionary. 2011.