Seminal vesicles


Each seminal vesicles, of which there are two, measure approximately 5 centimeters long. Positioned along the base of the urinary bladder, the seminal vesicles look like convoluted club-like features. The primary responsibility of the seminal vesicles is the production and secretion of the mildly alkaline and sticky yellow material which is known for maintaining viability of the spermatozoa.

The contents of the secretion includes a number of necessary nutrients such as fructose, citric acid, coagulation proteins, and prostaglandins.

Fructose has been determined to provide energy to the free floating spermatozoa. About 60% of seminal fluid is created by the secretions of the seminal vesicles.


Structurally, the seminal vesicles have a mucosal layer that is made up of an extensively coiled tubular design. The lumen and the mucosal layer conjoin and create various intercommunicating spaces which are specifically lined with glandular epithelium, which is a content mixture of both pseudostratified columnar epithelium as well as cuboidal secretory epithelium.


Seminal Vesicles
Image: Seminal Vesicles
The seminal vesicles receive their blood supply from the various branches of the middle rectal arteries. Sympathetic and parasympathetic neurons innervate the seminal vesicles.

Each ejaculatory duct receives its fill of fluid from the response of the seminal vesicles from the sympathetic neurons.
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