Seminalcolliculus

Seminalcolliculus, also known as the colliculus seminalis or verumontanum, is a rounded eminence in the posterior wall of the prostatic urethra. It is formed by the expansion of the urethral crest, a longitudinal ridge on the floor of the urethra. The seminal colliculus is an important anatomical landmark, as it is the site where the ejaculatory ducts, which carry sperm from the testes and seminal fluid from the seminal vesicles, open into the urethra.

Located centrally on the seminal colliculus is the prostatic utricle, a small, blind-ending pouch that is a remnant of the Müllerian ducts. This structure is homologous to the uterus and vagina in females. The ejaculatory ducts open on either side of the prostatic utricle. The muscles surrounding the ejaculatory ducts contract during ejaculation, propelling semen into the urethra.

The seminal colliculus plays a role in sexual function. During sexual arousal, smooth muscle and erectile tissue within the colliculus engorge, contributing to the sensation of ejaculation. Inflammation or enlargement of the seminal colliculus can lead to various urinary and ejaculatory symptoms, such as difficulty urinating, pain during ejaculation, and altered semen volume. These conditions may require medical evaluation and treatment. The precise anatomical relationships and vascular supply of the seminal colliculus are well-defined in medical literature and are important for surgical procedures involving the prostate and urethra.