Seminal vesicle - Definition

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There are two seminal vesicles, each resembling a small sack. These are glands connected to the prostate located above and behind it. They secrete the seminal fluid they store into the vas deferens that make up part of the system of sperm ducts. Seminal fluid provides the fluid component of sperm to enable the spermatozoa to travel, but also supplies nutritious substances to the sperm that the reproductive cells require for energy to move.