Descent of the testis, Biology

Assignment Help:

Descent of the Testis

The testis develops on the posterior abdominal wall at the mesonephric ridge. To reach the adult position in the scrotum, it must decent. A fibrous cord form and runs from the lower pole of the testis down the posterior abdominal wall and on to the underside of the anterior abdominal wall. The latter part forms the inguinal fold. The terminal part of the fibrous cord (the gubernaculum) negotiates the layers of the anterior abdominal wall and passes into the scrotum where it ends. The function of the gubernaculum is believed to be that of anchoring the testis during the process of straightening. As it descends into the scrotum at approximately the 8th month of fetal life, it draws with it a tube of peritioneum, the processus vaginalis. The lower part of the processus vaginalis remains patent and becomes the tunicia vaginalis testis. The upper part becomes a fibrous cord. If the processus remains patent throughout its length, a congenital indirect inguinal hernia will result. If isolated stretches of the upper part persist, a hydrocele results.

Both testes should be in the scrotum at birth. If the descent of the testis becomes arrested in the abdomen or inguinal canal, undescended testis (cryptorchism) results. The interstitial cells of Leydig will function normally in this position; therefore the
secondary male sex characteristics will appear at puberty, but the individual will be sterile because normal spermatogenesis cannot take place in the abdominal body temperature, as if can in its normal position in the cooler scrotum.


Related Discussions:- Descent of the testis

State the red blood cells in the body capillaries in a leg, Which of the fo...

Which of the following will lead to a decrease in the amount of oxygen delivered to the body cells in a leg? A. A decrease in hydrogen ion concentration in red blood cells in t

Does the fish heart pump venous or arterial blood, Q. Does the fish heart p...

Q. Does the fish heart pump venous or arterial blood? After oxygenation in the gills the arterial blood goes to the tissues so the fish heart pumps venous blood, the venous blo

Iodine test, what will happen to a plant kept in dark for 72 hours

what will happen to a plant kept in dark for 72 hours

Materials handling and storage, Materials Handling and Storage Materi...

Materials Handling and Storage Material handling is a very significant process in working place. The materials are handled in not finished, semi finished and finished states.

Determine the isotopes of uranium and thorium, Does radioactive dating with...

Does radioactive dating with isotopes of uranium and thorium provide an estimate of the starting, middle, or end of the period of Earth's formation? Explain your answer No, th

What is the mendel observations and conclusions, How would Mendel's observa...

How would Mendel's observations and conclusions have been dissimilar if many of the characteristics he studied, such as seed color and seed texture, had been controlled by genes lo

explain alternative processing, Alternative polyadenylation sites Exa...

Alternative polyadenylation sites Exact pre-mRNAs hold more than single group of signal sequences for 3' end polyadenylation and cleavage.   In  some  cases,  the  area  of  t

Stratification - aquatic ecosystems, Stratification - Aquatic ecosystems ...

Stratification - Aquatic ecosystems Aquatic ecosystems also exhibit marked stratification. In lake and ocean ecosystems light penetration, temperature and availability of oxyg

Explain the treatment options after endodontic failure, Explain the Treatme...

Explain the Treatment Options after Endodontic Failure a) Non-surgical retreatment "re-endo", b) Root-end surgery "if there is a will detected mistake as separated instrumen

History of animal taxonomy, Q. Show the History of animal taxonomy? The...

Q. Show the History of animal taxonomy? The beginning of animal taxonomy was made by Aristotle (384-322 B.C.). He extensively studied about anatomy, embryology, habit and ecolo

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd