Table Of Content
4. Phases of spermatogenesis
4.1 Phase1: Formation of primary spermatogonia and secondary spermatogonia
4.2 Phase2. release of spermatids into tubules( spermiation)
5. Phrases of Oogenesis
Gametogenesis is the formation of matured gamets from the precursor cells. Gametogenesis in a male is the spermatogenesis whereasx in a femal it is called oogenesis.
The development of sperms from the imature spermatocytes is known as spermatogenesis. It starts between the ages 14-19 years in a healthy and normal male. The process requires approximately 70 days , during which a series of multiplications and hormonal changes occur in the male reproductive system. On an average, a healthy male produces around ~200 million sperms a day. Spermatogenesis occur inside the testes - the seminiferous tubules. The processc is led under the influence of gonadotropin releasing hormone ( GNRH) produced from the hypothalamus (pituitary gland).Some of th eother harmones mediating the gametgenesis are In addition, luteinizing hormone ( LH) acts on Leydig cells of the testicles that stimulates the formation of testosterone . The testosterone plays a vital role in nourishing the testes.
Phases of Embryogenesis