Name the hormone responsible for descent of testes into the scrotum .why does this failure of this process result in Sterlity?

AMH, Androgens, Panacrine hormone, Gonadotrophins and Testesterone contribute to the descending of testes into the scrotum. Gonadotrophins acts on leydig cells which in turns stimulates the production of testerone which plays a major role in descent of testes from the scrotum.
The failure of the testes to descend into the scrotum causes sterility because sperm formation does not occur at the abdominal temperature. The human male possesses two testes lying in a scrotum outside the abdominal cavity. Sperm production is efficient at a temperature that is lower than the body temperature. Scortum  acts as a thermoregulator and enhances the sperm production by keeping the testes cool.
  • Cryptorchidism is the failure of one or both testes to descend.
  • Cryptorchidism or undescended testicle refers to a testis that has not moved into the scrotum before a baby is born. It occurs in around 5% of newborn boys.  Whether it is just one or both testicles, cryptorchidism generally corrects itself within a few months. It is believed that a combination of genetics, maternal health and hormonal change by some environmental factors could be the cause of cryptorchidism.

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Several factors, such as Hoxa-10, epidermal growth factor (EGF), calcitonin gene-related peptide (CGRP), and hormones, especially androgens and insulin-like factor 3 (INSL-3), have been suggested as being regulators of testicular descent.​​
The failure of this process does not lead to sterility but it creates more chances for testicular cancer. It can be treated by hormone injections or surgery. However the surgery might lead to infertility .

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main hormone involved is FSH(follical stimulating hormone).
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