anterior ejaculatory duct fly_anatomy.ontology FBbt:00004967 Duct that connects the vasa deferentia and accessory glands to the ejaculatory bulb in the male adult genitalia. It is 1.2mm long with an anterior dilated portion with a diameter of 120 micrometers, tapering to a narrow tube of 20 micrometers in diameter which enter the ejaculatory bulb. In the abdomen, it extends dorsally, then curves downward and to the left and loops over the rectum to the right side of segment 5 or 6. The duct wall consists of a single thick layer of epithelial cells lined with a thin chitinous intima surrounded by an inconspicuous outer sheath. male-specific anatomical entity ejaculatory duct epithelium duct