Tunica vaginalis

The tunica vaginalis is the pouch of serous membrane that covers the testes. It 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.

Tunica vaginalis
Diagram of a cross-section of a testicle. 1. Cavity of tunica vaginalis, 2. Visceral lamina, 3. Parietal lamina.
The right testis, exposed by laying open the tunica vaginalis. (Tunica vaginalis is labeled at upper right.)
Details
Identifiers
Latintunica vaginalis testis
Anatomical terminology

After its descent, that portion of the pouch which extends from the abdominal inguinal ring to near the upper part of the gland becomes obliterated; the lower portion remains as a shut sac, which invests the surface of each testis, and is reflected on to the internal surface of the scrotum; hence it may be described as consisting of a visceral and a parietal lamina.

Visceral lamina

The visceral lamina (lamina visceralis) covers the greater part of the testis and epididymis, connecting the latter to the testis by means of a distinct fold. From the posterior border of the gland it is reflected on to the internal surface of the scrotum.

Parietal lamina

The parietal lamina (lamina parietalis) is far more extensive than the visceral, extending upward for some distance in front and on the medial side of the cord, and reaching below the testis. The inner surface of the tunica vaginalis is smooth, and covered by a layer of simple squamous mesothelial cells. The interval between the visceral and parietal laminæ constitutes the cavity of the tunica vaginalis.

Cavum vaginale
Schematic drawing of a cross-section through the vaginal process. 1 testicle, 2 Epididymis, 3 Mesorchium, 4 Lamina visceralis of Tunica vaginalis, 5 Lamina parietalis of Tunica vaginalis, 6 Cavum vaginale, 7 Epididymis, 8 Fascia spermatica interna

The cavum vaginale is the cavity of the tunica vaginalis. The testicle hangs suspended in a space, the cavum vaginale, from which is separated by the visceral layer of the tunica vaginalis. The latter is continued on to the epididymis, at the lateral margins of which it is reflected forward as the parietal layer, and as this is more extensive than the visceral layer, the cavum vaginale-named cavity results. The testicle is enclosed in a thick capsule of fibrous tissue, the tunica albuginea. The tunica albuginea sends prolongations inwards, dividing the testicle into lobules. Each lobule contains the seminiferous tubules, extending from the base where they end blindly, towards the apex.[1]

Diseases
gollark: It's some sort of horrible protocol which works via XML over HTTP over UDP somehow.
gollark: I assume it's basically a dumb video output which gets software rendered pixels pushed to it.
gollark: Given the existence of HTTPS, they can't really do much on devices which aren't under their direct control. Yay progress/cryptography!
gollark: My school has ridiculously intrusive monitoring (seemingly including a keylogger) on the school-owned computer hardware, and for phones and stuff just route traffic through the mostly ineffective filtering proxy thing.
gollark: You can just... buy the components in it, for I think $2000 or so.

References

This article incorporates text in the public domain from page 1242 of the 20th edition of Gray's Anatomy (1918)  This article incorporates text from Spermatocele, by Edward T. Crossan, M.D., a publication from 1920 now in the public domain in the United States.

  1. DocCheck Medical Services GmbH. "Cavum vaginale". DocCheck Flexikon.
  2. Hydrocele in Emergency Medicine at eMedicine
  3. Paget, J (1855). "Account of a Growth of Cartilage in a Testicle and its Lymphatics, and in other parts". Medico-Chirurgical Transactions. 38: 247–260.9. doi:10.1177/095952875503800117. PMC 2104299. PMID 20896046.
  4. Garriga, Victoria; Serrano, Angel; Marin, Anna; Medrano, Santiago; Roson, Nuria; Pruna, Xavier (2009). "US of the Tunica Vaginalis Testis: Anatomic Relationships and Pathologic Conditions". RadioGraphics. 29 (7): 2017–32. doi:10.1148/rg.297095040. PMID 19926760.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.