Ejaculatory duct - wikipedia Ejaculatory duct Ejaculatory duct Male Anatomy Vesiculæ seminales and ampullæ of ductus deferentes, seen from the front. The anterior walls of the left ampulla, left seminal vesicle, and prostatic urethra have been cut away. Details Identifiers Latin Ductus ejaculatorius ( Plural : Ductus ejaculatorii ) MeSH A05. 360.444. 251 FMA 19325 Anatomical terminology ( edit on Wikidata ) The ejaculatory ducts ( ductus ejaculatorii ) are paired structures in male anatomy. Each ejaculatory duct is formed by the union of the vas deferens with the duct of the seminal vesicle. They pass through the prostate, and open into the urethra at the seminal colliculus. During ejaculation, semen passes through the prostate gland, enters the urethra and exits the body via the urinary meatus. Contents 1 Function 1.1 Ejaculation 2 Clinical relevance 2.1 Ejaculatory duct obstruction 2.2 Benign prostatic hyperplasia 3 Additional images 4 See also 5 References 6 External links Function Ejaculation Main article : Ejaculation Dissection of prostate showing ejaculatory ducts opening into the prostatic urethra. Ejaculation occurs in two stages, the emission stage and the expulsion stage. The emission stage involves the workings of several structures of the ejaculatory duct ; contractions of the prostate gland, the seminal vesicles, the bulbourethral gland and the vas deferens push fluids into the prostatic urethra. The semen is stored here until ejaculation occurs. Muscles at the base of the penis contract in order to propel the seminal fluid trapped in the prostatic urethra through the penile urethra and expel it through the urinary meatus. The ejaculate is expelled in spurts, due to the movement of the muscles propelling it. These muscle contractions are related to the sensations of orgasm for the male. Sperm is produced in the testes and enters the ejaculatory ducts via the vas deferens. As it passes by the seminal vesicles, a fluid rich in fructose combines with sperm. This addition nourishes the sperm in order to keep it active and motile. Seminal fluid continues down the ejaculatory duct into the prostate gland, where an alkaline prostatic fluid is added. This addition provides the texture and odor associated with semen. The alkalinity of the prostatic fluid serves to neutralize the acidity of the female vaginal tract in order to prolong the survival of sperm in this harsh environment. Semen is now a fructose - rich, alkaline fluid containing sperm as it enters the bulbourethral glands below the prostate. The bulbourethral glands secrete a small amount of clear fluid into the urethra before the ejaculate is expelled. The functions of this fluid are not entirely known but are suggested to aid in lubricating the male urethra in preparation for the semen during ejaculation. The amount of semen produced and expelled during ejaculation corresponds to the length of time that the male is sexually aroused before ejaculation occurs. Generally, the longer the period of arousal, the larger the amount of seminal fluid. Ejaculation and orgasm may occur simultaneously, however they are not coupled, in that one may occur without the other. For example, a man may have a dry orgasm ( termed Retrograde ejaculation ) ; there is no expulsion of ejaculate however the man still experiences orgasm. Also, paraplegics may ejaculate seminal fluid but not experience the sensation of orgasm. Clinical relevance Ejaculatory duct obstruction Main article : Ejaculatory duct obstruction Ejaculatory duct obstruction is an acquired or congenital pathological condition in which one or both ejaculatory ducts are obstructed. In the case that both ejaculatory ducts are obstructed, this illness presents with the symptoms of aspermia and male infertility., Benign prostatic hyperplasia Main article : Benign prostatic hyperplasia Surgery to correct benign prostatic hyperplasia may destroy these ducts resulting in retrograde ejaculation. Retrograde ejaculation empties the seminal fluid formed in the emission phase into the bladder of the male instead of expelling it through the urethra and out the tip of the penis. This results in a dry orgasm, where orgasm may still be experienced but without expulsion of semen from the ejaculatory ducts. Additional images Lobes of prostate Vertical section of bladder, penis and urethra. Prostate with seminal vesicles and seminal ducts, viewed from in front and above. Median sagittal section of male pelvis. See also This article uses anatomical terminology ; for an overview, see Anatomical terminology. Excretory duct of seminal gland References Jump up ^ Handbook of andrology. Jump up ^ `` Function of seminal vesicles and their role on male fertility ''. Asian Journal of Andrology : 251 -- 258. December 3, 2001. Archived from the original on 2016 - 03 - 03. ^ Jump up to : `` Andrology ''. ^ Jump up to : Rathus, S.A., Nevid, J.S., Fichner - Rathus, L., Herold, E.S. ( 2010 ). Human Sexuality in a World of Diversity. Pearsons Education Canada, Pearson Canada Inc. Toronto, ON. Jump up ^ `` Human Reproductive Biology ''. ^ Jump up to : Esmail, S. ( 2010 ). HECOL 211 Human Sexuality Lecture Manual 2010. Department of Human Ecology, University of Alberta, Edmonton, AB. Jump up ^ `` American Society of Andrology - Andrology Handbook, 2nd Edition ''. Jump up ^ Retrograde ejaculation treatments ^ Jump up to : `` Millennium Web Catalog ''. Jump up ^ `` Millennium Web Catalog ''. External links Anatomy figure : 44 : 03 - 15 at Human Anatomy Online, SUNY Downstate Medical Center - `` Lateral ( A ) and posterior ( B ) views of the bladder and associated structures. '' figures / chapter_34 / 34 - 3. HTM : Basic Human Anatomy at Dartmouth Medical School Male reproductive system Internal Seminal tract Testes layers Tunica vaginalis Tunica albuginea Tunica vasculosa Appendix Mediastinum Lobules Septa Leydig cell Sertoli cell Blood -- testis barrier Spermatogenesis Spermatogonium Spermatocytogenesis Spermatocyte Spermatidogenesis Spermatid Spermiogenesis Spermatozoon Other Seminiferous tubules Tubuli seminiferi recti Rete testis Efferent ducts Epididymis Appendix Stereocilia Paradidymis Spermatic cord Vas deferens Ampulla Ejaculatory duct Accessory glands Seminal vesicles excretory duct Prostate Urethral crest Seminal colliculus Prostatic utricle Ejaculatory duct Prostatic sinus Prostatic ducts Bulbourethral glands External Penis root Crus Bulb Fundiform ligament Suspensory ligament body Corpus cavernosum Corpus spongiosum glans Foreskin Frenulum Corona fascia superficial deep Tunica albuginea Septum of the penis Urinary tract Internal urethral orifice Urethra Prostatic Intermediate Spongy Navicular fossa External urethral orifice Lacunae of Morgagni Urethral gland Scrotum layers skin Dartos External spermatic fascia Cremaster Cremasteric fascia Internal spermatic fascia Perineal raphe Scrotal septum Retrieved from `` https://en.wikipedia.org/w/index.php?title=Ejaculatory_duct&oldid=814152361 '' Categories : Mammal male reproductive system Andrology Human penis anatomy Hidden categories : All articles with dead external links Articles with dead external links from December 2016 Articles with permanently dead external links Medicine infobox template using GraySubject or GrayPage Talk Contents About Wikipedia Беларуская Български Català Čeština Deutsch ދިވެހިބަސް Español Français Galego 한국어 Italiano Македонски 日本 語 Polski Português Română Русский Simple English Svenska Українська 中文 Edit links This page was last edited on 7 December 2017, at 04 : 26. 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Question: where does the ejaculatory duct enter the urethra
Answer: at the seminal colliculus