Internal urethral orifice

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Internal urethral orifice
Urinary bladder
The interior of bladder.
Latin ostium urethrae internum
Gray's subject #255 1232
Dorlands/Elsevier o_09/12602099

The internal urethral orifice is placed at the apex of the trigonum vesicae, in the most dependent part of the bladder, and is usually somewhat crescentic in form; the mucous membrane immediately behind it presents a slight elevation, the uvula vesicae, caused by the middle lobe of the prostate.

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

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Male reproductive system

Scrotum : layers (skin, Dartos, External spermatic fascia, Cremaster, Internal spermatic fascia) - Perineal raphe - Spermatic cord

Testes: layers (Tunica vaginalis, Tunica albuginea), Appendix, Mediastinum, Lobules, Septa, Leydig cell, Sertoli cell, Blood-testis barrier

Spermatogenesis: Spermatogonium, Spermatocytogenesis, Spermatocyte, Spermatidogenesis, Spermatid, Spermiogenesis, Spermatozoon

seminal tract: Seminiferous tubules (Tubuli seminiferi recti, Rete testis, Efferent ducts) - Epididymis  (Appendix) - Vas deferens - Ejaculatory duct  Seminal colliculus

urinary tract: Internal urethral orifice - Urethra (Prostatic, Intermediate, Spongy) - Urethral crest - Urethral gland - External urethral orifice

Penis: Corpus cavernosum - Corpus spongiosum - Navicular fossa of male urethra - Glans penis - Fundiform ligament - Suspensory ligament - Foreskin - Frenulum 

accessory glands: Seminal vesicles  (Excretory duct of seminal gland) - Prostate  (Prostatic utricle, Prostatic sinus) - Bulbourethral glands 

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