The vesicles lie behind the bladder at the end of the vasa deferentia. Lymphatic drainage occurs along the venous routes, draining into the internal iliac nodes. Blood is drained into the vesiculodeferential veins and the inferior vesical plexus, which drain into the internal iliac veins. The vesiculodeferential artery arises from the umbilical arteries, which branch directly from the internal iliac arteries. The vesicles receive blood supply from the vesiculodeferential artery, and also from the inferior vesical artery. The vesicles are between 5–10 cm in size, 3–5 cm in diameter, and have a volume of around 13 mL. The ejaculatory ducts pass through the prostate gland before opening separately into the verumontanum of the prostatic urethra. The lower part of the tube ends as a straight tube called the excretory duct which joins with the vas deferens of that side of the body to form an ejaculatory duct. Each vesicle is a coiled and folded tube, with occasional outpouchings termed diverticula in its wall. The seminal vesicles are a pair of glands in males that are positioned below the urinary bladder and at the end of the vasa deferentia, where they enter the prostate. The seminal vesicles have been described as early as the second century AD by Galen, although the vesicles only received their name much later, as they were initially described using the term from which the word prostate is derived. Other conditions may affect the vesicles, including congenital abnormalities such as failure or incomplete formation, and, uncommonly, tumours.
It is usually treated with antibiotics, although may require surgical drainage in complicated cases. Seminal vesiculitis can cause pain in the lower abdomen, scrotum, penis or peritoneum, painful ejaculation, and blood in the semen. Inflammation of the seminal vesicles is called seminal vesiculitis, most often is due to bacterial infection as a result of a sexually transmitted disease or following a surgical procedure. The vesicles are present in many groups of mammals, but not marsupials, monotremes or carnivores. The glands are lined with column-shaped and cuboidal cells. They receive blood from the vesiculodeferential artery, and drain into the vesiculodeferential veins. They have multiple outpouchings which contain secretory glands, which join together with the vas deferens at the ejaculatory duct. The vesicles are 5–10 cm in size, 3–5 cm in diameter, and are located between the bladder and the rectum. They secrete fluid that partly composes the semen. The seminal vesicles (also called vesicular glands, or seminal glands) are a pair of two convoluted tubular glands that lie behind the urinary bladder of some male mammals.
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