FUNCTIONS OF TESTES ::
It has two functions ::
1.To produce spermatozoa
2.To secrete an internal secretion called testosterone a hormone which consists of anabolic and sex fractions
SPERMATOZOA ::
They are produced by seminiferous tubules of testes by the process of spermatogenesis which proceed from spermatogonia to spermatocytes and then to spermatids and finally to spermatozoa
Spermatozoa are very minute living structurcs with a head neck body and tail The head is oval and represents the nucleus The neck is short and weak The body has rings of fibrils with a sheath The tail is again a fibril spiral with a sheath The end part is only fibril and is like a flagella and has ciliary characteristics
There are about one lac spermatozoa per cmm of semen and each ejaculation contains a few cc of semen Hence there are trillions of spermatozoa for every discharge They are very minute and sensitive and can be alive for one to two months In the female genital tract they hardly live for 2-3 days If there are less than 20 millions of spermatozoa per cc in the semen then fertilisation generally does not occur
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