The sperm ducts
Ductus deferens, seminal glands and ejaculatory ducts
The tubes and glands that carry sperm from the testes and add fluid to make semen.
What it does
The vas deferens carries sperm from each testis up into the pelvis. Behind the bladder it meets a seminal gland, which adds a sugary fluid that feeds the sperm. The joined duct then opens into the urethra inside the prostate.
Surprising fact
A vasectomy works by cutting the vas deferens, which stops sperm reaching semen without changing how much fluid is ejaculated, because most of the fluid comes from the glands.
Why it matters
Vasectomy is one of the most reliable forms of contraception and is usually done in a short procedure under local anaesthetic.
Nearby
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Sources
Drafted with AI help; awaiting a human fact-check against these sources.
Open in the 3D atlas · Suggest a correction · Not medical advice.
3D models: Z-Anatomy & BodyParts3D (CC BY-SA 4.0 / 2.1 JP). Card text CC BY 4.0.