The paired seminal vesicles lie posterior to the urinary bladder. Each consists of a single, highly convoluted, tube-shaped gland surrounded by a layer of smooth muscle. The duct of the seminal vesicle joins with the ampulla of the ductus deferens, just as the ductus enters the prostate gland to become the ejaculatory duct. 40x
Secretory tube of seminal vesicle >
The seminal vesicles contribute fructose, prostaglandins and ascorbic acid to the seminal fluid. Fructose provides the major nutritional source for spermatozoa. The secretion of the seminal vesicle is slightly alkaline, helping to neutralize the acidity of the vagina. The seminal vesicle secretes the majority of the seminal fluid.
- Lumen >
The mucosa of the gland forms innumerable, interconnecting arches subdividing the lumen. Therefore, the lumen of the gland is seen not only as a central space (black arrows) but also as a lacey maze of chambers (blue arrows) between the arches and surrounding the central lumen.
- Smooth muscle >
The mucosa of the seminal vesicle is surrounded by a layer of smooth muscle that helps propel the secretions from the gland.
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