myoid cells

1. cells found in the seminiferous tubules of common laboratory rodents, which cytologically resemble smooth muscle and are presumed to be contractile and to be responsible for the rhythmic shallow contractions of the seminiferous tubules of these species; called also peritubular contractile c's. 2. striated muscle cells found in the thymus of nonmammalian vertebrates, especially reptiles and birds, and rarely in mammals; called also Hammar myoid c's.