Explain the structure of the following. (a) Testes (b) Ovary

Explanation

(a) Testes: Testes are the reproductive glands of the male, that are Oval shaped, which lie outside the abdominal cavity of a man, in a sac like structure called Scrotum. Each testes is covered with a layer of fibrous tissue called tunica albuginea. Septa divides the testes into pyramidal lobules, in which lie seminiferous tubules, cells of Sertoli and the Leydig cells. The process of spermatogenesis takes place in the seminiferous tubules. The sertoli cells are the supporting cells and provide nutrients to the developing sperms. The leydig cells lie between the seminiferous tubules and secrete testosterone. It initiates the process of spermatogenesis.
(b) Ovary: Ovaries are located on either side of the lower abdomen, composed of two almond shaped bodies, each lying near the lateral end of fallopian tube. Each ovary has an outer cortex and an inner medulla. The cortex is composed of a network of connective tissue called as stroma and is lined by the germinal epithelium. The epithelial cells called the granulosa cells surround each ovum in the ovarv together forming the primary follicle. As the egg grows larger, the follicle also enlarges and gets filled with the fluid and is called the Graafian follicle.