Seminal vesicle

Glandula vesiculosa

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Shown on the male body.

What it is

Lobulated sac behind the bladder base, lateral to the ampulla of the vas deferens; it is really a single tube about 15 cm long folded on itself. Its duct joins the vas to form the ejaculatory duct.

Function

Secretes 60–70% of the semen volume: a thick, alkaline, fructose-rich fluid that fuels sperm.

Size

About 5 cm long and 1–2 cm wide.

Clinical note

Its secretion contains semenogelin, which makes semen clot briefly after ejaculation.