This duct then enters the duodenum at the ampulla of Vater. The ampulla is specifically located at the major duodenal papilla. Fertilization occurs in the ampulla, the section of the oviduct that curves around the ovary. Other biliary tract cancers include gallbladder cancer and cancer of the ampulla of Vater. It is later joined by the pancreatic duct to form the ampulla of Vater. The sphincter of Oddi is a muscular valve that controls the opening to the ampulla. This usually takes place in the ampulla of one of the fallopian tubes. Within the ampulla is a mound of hair cells and supporting cells called crista ampullaris. The expanded end is the ampulla, which stores sperm before ejaculation. Short lateral canals branch off the radial canals, each one ending in an ampulla. Each ampulla is a bundle of sensory cells containing multiple nerve fibres. That is 5/1,000,000,000 of a volt measured in a centimeter-long ampulla. One version explains that an angel descended with the Fleur-de-lis ampulla to anoint the king. Bushcricket males offer a spermatophylax containing an ampulla. The food then moves down to the stomach, which is in the ampulla.