Anatomy of the Vas Deferens
The vas deferens transport mature sperm to the urethra before ejaculation.
They are best described as a pair of hard, thick-walled, muscular tubes.
These two tubes are identical and are each up to approximately 18 inches (45 centimeters) long.
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The vas deferens begin at theepididymis(where sperm is stored after it is made in the testes).
From the epididymis, the vas deferens extend through the pelvis to the bladder.
The storage chambers join up with the ejaculatory ducts which connect them to the urethra.
The actual structure of the vas deferens has three layers.
The innermost layer (the mucous coat) is lined with columnar epithelial cells.
Some people with congenital absence of the vas deferens can father children with the assistance of reproductive technology.
The vas deferens contract to propel the sperm forward.
Sometimes these obstructions can be surgically corrected to restore the proper flow ofsperm and fertility.
Inflammation
Inflammation of the vas deferens is a rare condition sometimes referred to as vasitis.
While rare, infections can also cause inflammation of the vas deferens.
It is one of the most widely used forms of male contraception available.
This procedure is often done in a healthcare provider’s office or a surgical center under local anesthesia.
This makes it the fourth most common form of contraception.
While vasectomies are intended to cause permanent sterilization, they can occasionally bereversed with surgery(vasovasostomy).
They can also, on occasion, fail as the vas deferens can reconnect (called recanalization).
Until a positive confirmation of sterility comes back from the laboratory, backup contraception must be used.
This usually takes at least three months.
These tubes are cut or closed off during a vasectomy.
Post-vasectomy, semen must be tested periodically to confirm that no sperm is present or motile.
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