Ampulla of ductus deferens
Encyclopedia
At the fundus of the bladder
Urinary bladder
The urinary bladder is the organ that collects urine excreted by the kidneys before disposal by urination. A hollow muscular, and distensible organ, the bladder sits on the pelvic floor...

 the ductus deferens of some mammalian
Mammal
Mammals are members of a class of air-breathing vertebrate animals characterised by the possession of endothermy, hair, three middle ear bones, and mammary glands functional in mothers with young...

species becomes enlarged and sometimes tortuous. This portion is termed the ampulla.
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