The seminal vesicle is found in men and are responsible for distributing the majority of fluid during ejaculation. They help pass 60 percent of fluid distributed from the male at this time.
The seminal vesicle is commonly found in male mammals, including humans. The seminal vesicle secretes most of the semen that is ejaculated. The thick fluid contains a mixture of substances, including citric acid, proteins, sugar fructose and potassium.
The seminal vesicle can measure as long as 2.75 inches long. It typically is 3 centimeters wide. The activity of the seminal vesicle depends on hormones, particularly androgen. Androgen stimulates growth and activity of the seminal vesicles.