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What is EMBRYOLOGY?What is EMBRYOLOGY? All the cells of the body are formed from a single cell called All the cells of the body are formed from a single cell called

ZYGOTEZYGOTE It is formed by the union of female germ cell called It is formed by the union of female germ cell called ovumovum & the & the

male germ cell called male germ cell called spermatozoonspermatozoon Enormous no. of cell are produced by repeated process of Enormous no. of cell are produced by repeated process of cell-cell-

divisiondivision Which ultimately give rise to an Which ultimately give rise to an OrganismOrganism

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EMBRYOLOGYEMBRYOLOGY It is a branch of Development Anatomy which describes the It is a branch of Development Anatomy which describes the

changes & processes of changes up to birthchanges & processes of changes up to birthParts of EmbryologyParts of Embryology General EmbryologyGeneral Embryology Systemic EmbryologySystemic Embryology

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Stages of Development (Total 38-40 weeks)Stages of Development (Total 38-40 weeks) Pre embryonic period: 1Pre embryonic period: 1stst – 2 – 2ndnd weeks weeks

Ovum fertilized, proliferates & give rise to Bilaminar germ Ovum fertilized, proliferates & give rise to Bilaminar germ layerslayers

Embryonic period: 3Embryonic period: 3rdrd -8 -8thth weeks weeksFormation of trilaminar germ disc. 3 germ layers give rise to Formation of trilaminar germ disc. 3 germ layers give rise to specific tissues & organsspecific tissues & organs

Fetal period: 9 weeks – BirthFetal period: 9 weeks – BirthMaturation of tissues, organs & rapid growth of body occursMaturation of tissues, organs & rapid growth of body occurs