Seminal Vesicle


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Related to Seminal Vesicle: bulbourethral gland, seminal vesicle cyst

seminal vesicle

[′sem·ən·əl ′ves·i·kəl]
(anatomy)
A saclike, glandular diverticulum on each ductus deferens in male vertebrates; it is united with the excretory duct and serves for temporary storage of semen.

Seminal Vesicle

 

in male salientians and birds and in some male fish and mammals (including man), a glandular widening or protrusion of the terminal portion of the seminal duct that releases an alkaline mucosal secretion needed to nourish and mobilize spermatozoa. In most animals the secretion of the seminal vesicles is a component of semen that serves to liquefy sperm and, in some animals, promotes the formation of sper-matophores from sperm.

Seminal vesicles are paired or unpaired. They are formed during embryonic development from various portions of the deferent ducts and may be simple widenings or sacculated processes of the ducts. In some animals seminal vesicles are independent structures united to the deferent ducts only by a narrow canal. Seminal vesicles are especially developed in some rodents and insectivores; they are absent in monotremes, marsupials and many predatory animals.

In man, the seminal vesicles form a paired organ 4–5 cm long, 2 cm wide, and 1.0–1.5 cm thick. They are located in connective tissue between the posteroinferior surface of the urinary bladder and the rectum, adjacent to the base of the prostate. The vesicles are convoluted tubes with numerous recesses. The vesicular wall consists of an external connective-tissue membrane, a weakly developed muscular membrane, a submucosal layer, and a mucous membrane with columnar or cubical epithelium. The excretory duct of the seminal vesicles is connected to the terminal portion of the seminal canal, forming the ejaculatory duct.

References in periodicals archive ?
Primary seminal vesicle cystadenoma, which frequently involves middle-aged and elderly men, is a benign tumor originating from the embryological residues of the mullerian ducts.
2014) and store it in two seminal vesicles (Polis & Sissom 1990; Peretti & Battan-Horenstein 2003; Vrech 2013).
The rarity of our case lies in the synchronous presence of bilaterally hypoplastic seminal vesicles (SV), varicocele, and azoospermia, extending the presenting spectrum of type III testicular ectopia which currently includes SV aplasia and SV cystic malformation [7].
Holandric, incipient funnels in 10 and 11; Acinous seminal vesicles in 11 and 12; not fully developed, they cover the dorsal part of the esophagus.
However, at the end of treatment, absolute and relative full seminal vesicle weights were significantly decreased in the group treated with 3.0 mg/Kg/day of [As.sub.2][O.sub.3].
villosa, the spermatozoa were long, threadlike, linear, and free from each other in the seminal vesicle as also observed in the ant Acromyrmex subterraneus (Forel) (Hymenoptera: Formicidae) (Moreira et al.
Locally advanced prostate cancer is the one extending beyond the prostate capsule with invasion of peri-capsular tissue, apex, bladder neck or seminal vesicles but without any lymph node involvement or distant metastasis (i.e.
A long and wide oesophagus bifurcates to two intestinal caeca over anterior to seminal vesicle, extending posteriorly to the lateral margins at the level of acetabulum.
The wet weights of the vital organs (heart normalized to body weight, kidney normalized to body weight, spleen and adrenal) and reproductive organs (testes, prostate, epidydimis, an seminal vesicle) were recorded at the time of termination of experiment.
After 30 days, the animals were sacrificed and prostates as well as seminal vesicles excised and weighted in order to calculate prostate volume index (PVI) as well as prostate index (PI) and seminal vesicle index (SVI), defined as organ weight in g per 100 g body weight.