part of copulatory bulb spermophor spider_anatomy The tube inside the copulatory bulb containing the sperm. It runs from the blind fundus in the subtegulum, to an opening in the embolus. It is often sclerotized and served by many glands. ejaculatory duct SPD:0000177 According to Comstock (1910), the spermophor (his receptaculum seminis) consists of three parts: the fundus, the reservoir, and the ejaculatory duct. These parts often do not have clear limits. sperm duct receptaculum seminis integumental tube