external lamina
英[eksˈtə:nl ˈlæminə]美[ɪkˈstɚnəl ˈlæmənə]
External lamina is a structure similar to basal lamina that surrounds the sarcolemma of muscle cells. It is secreted by myocytes and consists primarily of Collagen type IV, laminin and perlecan (heparan sulfate proteoglycan).