Descent of the testis, Biology

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.

Posted Date: 10/27/2012 2:40:10 AM | Location : United States







Related Discussions:- Descent of the testis, Assignment Help, Ask Question on Descent of the testis, Get Answer, Expert's Help, Descent of the testis Discussions

Write discussion on Descent of the testis
Your posts are moderated
Related Questions
CT is a 3 year old female who develops signs of hypoglycemia in the early morning unless she is fed during the night.  CT eats balanced meals for her age group during the day, with

Q. Explain about Malnutrition Related Diabetes Mellitus? This type of diabetes has been categorized as a separate entity. 'if is 'Men seen commonly in developing countries, 1n

Define Reagents for seliwanoff's test? - Sugar solutions of glucose, fructose, galactose, lactose, maltose, sucrose and starch - Resorcinol in dilute hydrochloric acid (1:

What are the Advanced surgical procedures The scope of implantology has widened to include many more clinical situations which would be hitherto contraindicated for implants du

Define Methods of Food Processing? Food is undeniably most vital to the survival of human beings. Hence, it must be processed using various scientific techniques. This is done

Mechanics of Locomotion Among annelids, polychaetes, hence more primitive than the other two groups, show a more complex mode of locomotion. Necessarily, the locomotion in po

Surgical Considerations in anterior mandibular region During the harvesting of a monocortical symphyseal block of bone from the mandibular symphysis region (autogenous block bo

Why in some cases is mitosis a synonym of reproduction? In some living beings asexual reproduction happens by many means: binary division, schizogony, budding, grafting, etc. I

Q. How does the male gamete penetrate the egg cell? How does the female gamete protect itself from the entrance of more gametes after the entrance of the first sperm cell? The

Define about the Photometry - colorimetry? Photometry is the measurement of the luminous intensity light or the amount of luminous light falling on a surface from such a source