精嚢
either of a pair of glands located on either side of the male urinary bladder that open into the vas deferens and that secrete many components of semen during ejaculation
男性の膀胱のどちらか一方の側に位置する1組の分泌線のうちのいずれかで、輸精管に通じており、射精の際には、精液の成分を多く分泌する