14. Spermatogenesis = m aturation process of male gametes ; includes the series of events leading to transformation of spermatogonia into haploid spermatids ; t hese then develop into ripe (mature) sperms by gradual process known as spermiogenesis ( = histological differentiation of spermatids ) 3 phases: s permiogenesis meiosis s perm atocyt ogenesis
15. the site where spermatozoa undergo their development and maturation are s eminiferous tubules of the testis development from the spermatogonium to fully differentiated spermatozoon lasts 64 –74 days in avarrage
30. Early blastocyst Late (mature) blastocyst (with the zona) (denuded) d uring the day 6 , the zona pellucida becomes to digest by enzymes contained in the uterine fluid and soon disappears t he denuded blastocyst then expands up to diameter of 400 m or more and is prepared to start the implantation
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Editor's Notes
5th month: 7 million oogonia ////// Beginning of 3rd month the cells start to enter the prophase of the first meiotic division. Primary oocyte are lost during development and around puberty the women have 300000 oocytes. Reproductive life 30-40 years. Menstruation cycle 28 days……450 eggs are released
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