1. The male vagina is a more accurate term than prostatic utricle.

    The prostatic utricle is a cul-de-sac of the prostatic urethra and extends backward and slightly upward for a very short distance within the middle lobe of the prostate. It is composed of fibrous tissue, muscular fibers, and mucous membrane. The prostatic utricle is 10-12 mm long, sometimes it is 20-25 mm, rarely it is 6-8 cm long.1 It is located in the seminal colliculus (i.e. veru montanum): this is a prominence of the dorsal surface of the prostatic urethra in which the two ejaculatory ducts open and among them exists the prostatic utricle, besides sometimes the ejaculatory ducts open into the prostatic utricle and not into the prostatic urethra.1,2 The prostatic utricle and the female vagina develop from the sinovaginal bulb that grows from the dorsal wall of the urogenital sinus to the level of the Mullerian tubercle, without the contribution of the Mullerian ducts.1,2 The fused Mullerian ducts form the uterus up to the external cervical os, and the inducing mesonephric ducts regress cranially, although they enlarge caudally from the level of the cervical os, form the sinuvaginal bulbs, incorporate the Mullerian tubercle's cells, and give rise to the vaginal plate. The embryological development of the human vagina does not proceed from the Mullerian ducts (as classically thought) but from the Wolffian ducts and Mullerian tubercle.3 In females, only the body of the uterus and the uterine tubes are formed by the Mullerian ducts.1,2 This has been known for many decades, but according to current opinion in urology textbooks the female vagina is still a mixed structure, formed by the urogenital sinus and from the Mullerian ducts, even if we know that the vagina always has the same structure for all of its length, furthermore the glycogen is present in the epithelium of the urogenital sinus, in the vagina, and cervix, while it is missing in the Mullerian ducts.1 The prostate utricle is of urogenital sinus origin and forms as a separate structure as the entire caudal ends of the mullerian ducts undergo complete regression.4 In conclusion, the prostate utricle is the homologue of the female vagina: male vagina is a more accurate term than prostatic utricle. References 1. Testut L, Latarjet A. Traite d'Anatomie Humaine, neuvieme edition. Paris: G. Doin &; 1972. 2. Puppo V. Anatomy and Physiology of the Clitoris, Vestibular Bulbs, and Labia Minora With a Review of the Female Orgasm and the Prevention of Female Sexual Dysfunction. Clin Anat 2013; 26: 134-52. 3. Acien P, Acien MI. The history of female genital tract malformation classifications and proposal of an updated system. Hum Reprod Update 2011;17:693-705. 4. Shapiro E, et al. The prostatic utricle is not a Mullerian duct remnant: Immunohistochemical evidence for a distinct urogenital sinus origin. J Urol. 2004;172:1753-56.

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