The fibrous sheath enveloping each of the fascicles of skeletal muscle fibers. [peri- + G. mys, muscle]
- p. externum SYN: epimysium.
- p. internum in the older literature, a term referring to the connective tissue around secondary and tertiary fascicles and individual fibers and also to the supporting framework of the myocardium.
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peri·my·si·um .per-ə-'miz(h)-ē-əm n, pl -sia -ē-ə the connective-tissue sheath that surrounds a muscle and forms sheaths for the bundles of muscle fibers
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n.
the fibrous sheath that surrounds each bundle of muscle fibres.
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peri·mys·i·um (per″ĭ-misґe-əm) pl. perimysґia [peri- + Gr. mys muscle] [TA] the connective tissue demarcating a fascicle of skeletal muscle fibers; called also internal p., or p. internum. perimysial adjMedical dictionary. 2011.