part_of adult oviduct adult oviduct ampulla Fig. 16-3, Fig. 16-4, in Biology of Ticks ISBN:0-19-505910-7. In argasid ticks, the oviducts expand into large thick bulbous structures near the point where the oviducts merge with theuterus. The walls of the ampullae are considerably thicker than the other regions of the oviduct. The function of the ampullae is unknown. Ampullae have not been reported to occur in ixodid ticks. TADS:0000420 TADS:0000420 default_namespace