Question : (a) Describe the histological structure of human testis with the help of a labelled diagram. (b) Discuss the significance of extra-abdominal location of testes.

Question : (a) Describe the histological structure of human testis wit

1.	Question : (a) Describe the histological structure of human testis with the help of a labelled diagram. (b) Discuss the significance of extra-abdominal location of testes.
Answer» Solution :(a) Internally each testis is divided into about250 testicular lobules by ingrowths of capsule of testis. Each testicular lobule has one to threeconvoluted tubules called seminiferous tubules or crypts. Each crypt is lined by germinal epitheliumwhich is formed of cuboidal germ cells (formsperms) and pyramidal-shaped sertoli or nursecells (PROVIDE NUTRITION to developing sperms).Scattered in interstitial SPACES between seminiferous tubules, there are groups of endocrine cells, called Leydig.s cells, which secrete androgens, mostimportant of which is testosterone. (b) In human male, testes are extra-abdominal in position and lie in skin pouches, called scrotal sacs, whichact as thermoregulators and keep the testicular temperature `2^@C`lower than the body temperature for normal spermatogenesis.