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Gametogenesis.Production of primordial germ cells and maturation of gametes :The goals of gametogenesis .Production of haploid cells.1 .Morphological changes of gametes that will facilitate fertilization .2 Primordial spermatogonium Primordial oogonium 2N spermatogenesis spermatozoon ovum N

Gametogenesisoogenesis

63 LH :1. MPF Maturation Promoting . Factor 2. . 3. .

( )oogenesis 7Prenatal Maturation Postnatal Maturation . I ( ) . II ( )

5th-7th month 7 millions At birth 2 millions 000004 Puberty

Female

OMI

- Puberty Maturation )Follicle Maturation )PostnatalGranulosa cells

Theca Folliculi

Primary follicle

)-Secodary follicle )Antral Theca Folliculi

)Mature )Graafian Follicle

Granulosa cells

Secondary )antral( follicle

Follicular development Primordial follicle Primary follicle Secondary )Antral( follicle Mature )preovulatory, Graafian( follicle.

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1. Spermatogonia PrimordialGerm Cells Type A dark Type A pale Type B

2. I ,II

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Spermiogenesis .3

Spermatid Spermatozoon

Seminiferous tubules

Primordial germcells Spermatogonia Primary Spermatocytes 1 Secondary Spermatocytes 2 Spermatids Spermatozoa

Primordial germcells Oogonia Primary oocytes 1 Secondary oocytes 2 Mature oocytes

Puberty

Fertilization II Ovulation II II Puberty I I Prenatal ( I ( Diplotene

Corpus luteum 4 7

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