(i) During spermatogenesis, one spermatogonium produces four sperms, (ii) Sperms have half the number of chromosomes. FSH acts on spermatogonia to stimulate sperm production. ABP concentrates testosterone in the seminiferous tubules. LH acts on the Leydig’s cells of the testes to secrete testosterone.įSH acts on Sertoli cells of the seminiferous tubules of the testes to secrete an androgen binding protein (ABP) and inhibin. GnRH acts on the anterior lobe of pituitary gland to secrete luteinizing hormone (LH) and follicle stimulating hormone (FSH).

Spermatogenesis is initiated due to increase in gonadotropin-releasing hormone (GnRH) by the hypothalamus. After spermiogenesis sperm heads become embedded in the Sertoli cells and are finally released from the seminiferous tubules by the process called spermiation. Thus four sperms are formed from one spermatogonium. The spermatozoa are later on known as sperms. The transformation of spermatids into spermatozoa is called spermiogenesis or spermateliosis. (ii) Formation of Spermatozoa from Spermatids (Spermatogenesis): Both secondary spermatocytes now undergo second maturation division which is an ordinary mitotic division to form, four haploid spermatids, by each primary spermatocyte.

Hence, the primary spermatocyte divides into two haploid daughter cells called secondary spermatocytes. The first maturation division is reductional or meiotic. Each primary spermatocyte undergoes two successive divisions, called maturation divisions.

Gametogenesis oogenesis