Why does the end of the vas deferens dilate?

Why does the end of the vas deferens dilate? Correct Answer For temporary storage of sperms

The vas deferens loops over the urinary bladder where it is joined by duct from the seminal vesicle to form the ejaculatory duct. The end of the vas deferens dilates to form a spindle-like ampulla for temporary storage of sperm.

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