tunica vaginalis

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      The tunica vaginalis is a pouch of serous membrane within the scrotum that lines the testis and epididymis (visceral layer of tunica vaginalis), and the inner surface of the scrotum (parietal layer of tunica vaginalis). It is the outermost of the three layers that constitute the capsule of the testis, with the tunica albuginea of testis situated beneath it.
      It is the remnant of a pouch of peritoneum which is pulled into the scrotum by the testis as it descends out of the abdominal cavity during foetal development.


      Anatomy




      = Visceral layer

      =
      The visceral layer of tunica vaginalis of testis (lamina visceralis tunicae vaginalis testis) is the portion of the tunica vaginalis that covers the testis and epididymis. It is the superficial-most of the three layers that constitute the capsule of the testis, with the tunica albuginea of testis situated deep to it. Posteriorly, the visceral layer does not line the surface of the testis - instead, it passes onto the epididymis where the latter attaches to the testis before continuing onto the inner surface of the scrotum as the parietal layer.


      = Parietal layer

      =
      The parietal layer of tunica vaginalis of testis (lamina parietalis tunicae vaginalis testis) is the portion of the tunica vaginalis that lines the inner surface of the scrotum. It is supported by the internal spermatic fascia.


      = Cavity of the tunica vaginalis

      =

      The cavity of the tunica vaginalis (also: cavum of the tunica vaginalis, or cavum vaginale) is the cavity between the visceral layer and the parietal layer of tunica vaginalis. It is normally occupied by a small amount of clear, lightly coloured fluid.
      The volume of the fluid in the cavity may increase abnormally when lymphatic drainage is impeded (due to inflammation, neoplasm, or trauma).


      Development


      The tunica vaginalis is derived from the vaginal process of the peritoneum, which in the fetus precedes the descent of the testes from the abdomen into the scrotum. The vaginal process between the abdominal inguinal ring and the superior part of the testis is then obliterated, usually leaving a string-like or cord-like remnant adjacent to the spermatic cord. If the vaginal process fails to obliterate, the communication between the peritoneal cavity and scrotum persists after birth, predisposing the individual to indirect inguinal hernia, and hydrocele testis.


      Diseases


      Mesothelioma
      Hydrocele
      Cartilaginous bodies
      Hematocele


      References




      External links


      Diagram at aspiruslibrary.org
      Anatomy photo:36:st-1502 at the SUNY Downstate Medical Center - "Inguinal Region, Scrotum and Testes: Tunic"
      Swiss embryology (from UL, UB, and UF) ugenital/diffmorpho04
      inguinalregion at The Anatomy Lesson by Wesley Norman (Georgetown University) (testes)

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    Tunica vaginalis - Wikipedia

    The tunica vaginalis is a pouch of [2] serous membrane [3] within the scrotum that lines the testis and epididymis (visceral layer of tunica vaginalis), and the inner surface of the scrotum (parietal layer of tunica vaginalis).

    Tunica vaginalis (testis) | Radiology Reference Article ...

    Oct 10, 2024 · The tunica vaginalis (TV) represents the investing serosal covering of the testis. It forms as the embryological testis descends and passes out through the superficial inguinal ring carrying its abdominal peritoneal covering with it.

    Testes: Anatomy, definition and diagram - Kenhub

    Nov 3, 2023 · The tunica vaginalis is the peritoneal sac that partially encloses the testes. It is derived from the embryonic vaginal process. This process is the outpouching of the parietal peritoneum, which follows the testes during descent and then encloses them. It …

    Tunica vaginalis - Location, Anatomy, Function and Pictures

    Sep 24, 2012 · What is Tunica vaginalis? It refers to a mesothelium-lined serous sac that contains the testicle and sections of the body and tip of the epididymis. It is the serous membranous covering of the testis, except the posterior region.

    The Testes and Epididymis - Structure - TeachMeAnatomy

    Oct 15, 2023 · Inside the scrotum, the testes are covered almost entirely by the tunica vaginalis, a closed sac of parietal peritoneal origin that contains a small amount of viscous fluid.

    Anatomy, Abdomen and Pelvis: Testes - StatPearls - NCBI Bookshelf

    Apr 15, 2023 · During development the inguinal canal contains the processus vaginalis, which is a structure that develops from the peritoneum. It allows the testes to descend and then eventally undergoes apoptosis and becomes the tunica vaginalis which surrounds part of the testis.

    Tunica vaginalis testis - e-Anatomy - IMAIOS

    The Tunica Vaginalis (tunica vaginalis propria testis) is the serous covering of the testis. It is a pouch of serous membrane, derived from the saccus vaginalis of the peritoneum, which in the fetus preceded the descent of the testis from the abdomen into the scrotum.