Fine structure of the regional differentiation of the ductus ejaculatorius simplex (EJ1, EJ2, EJ3) along with the role of their secretions in sperm activation and motility in two Noctuid species,Heliothis armigera (Hübner) andSpodoptera litura (Fabricius) (Lepidoptera). II. Fine structure and function of simplex 2 (EJ2)
The mid region (EJ2) of common ejaculatory duct is characterised by secreting intensity varying white viscous secretion together with a small segment of the milky white viscous secretion. The milky white segment possesses as the optimum amount of activator, high molecular weight protein between 30,000 and 60,000 capable of disaggregating eupyrene sperm bundles besides possessing the activating substance.