This branched tubular gland lined by simple columnar epithelium is an enlargement of the ductus deferens in its terminal portion. This is a typical tubular gland in ruminants, horses and dogs; absent in the cat and poorly developed in boars. The function of the white serous secretion is not known.
The secretory endpieces of this gland are lined with simple columnar epithelium; the main ducts are lined with stratified columnar epithelium. These glands do not occur in carnivores, but are present in some form in horses, ruminants and swine. Seminal fuid, the product of this gland, serves as a vehicle for the transport of spermatozoa.
Grossly the prostate gland can be divided into two parts: the body and the disseminate part. Low cuboidal to low columnar epithelium provides the lining for this compound, tubuloalveolar gland which consists primarily of serous secretory end pieces. The secretion of this gland is more serous in dogs and more mucous in bulls. It serves to promote the movement of spermatozoa and to form a vaginal plug. Additionally, in bulls, the secretion contains high amounts of fructose and citric acid. Concretions may be present in the secretory end pieces as well as parts of the duct system.
The lining of these paired, compound, tubuloalveloar glands is simple columnar epithelium. A capsule of dense connective tissue contains some smooth muscle as well as skeletal muscle of the bulbocavernous and urethral muscles. All domestic species have these glands except the dog, and their mucous secretion serves to clear the urethra of urine and to lubricate it and the vagina. The product may also serve as an energy source for the spermatozoa.
In some species, branched tubular mucous glands are found along the length of the urethra, especially dorsal to the lumen of the urethra. The exact function of their product is not clear.
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