1 introduction to embryology

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1 introduction to embryology

  1. 1. What is EMBRYOLOGY?  All the cells of the body are formed from a single cell called ZYGOTE  It is formed by the union of female germ cell called ovum & the male germ cell called spermatozoon  Enormous no. of cell are produced by repeated process of cell-division  Which ultimately give rise to an Organism 11/28/13 1
  2. 2. EMBRYOLOGY  It is a branch of Development Anatomy which describes the changes & processes of changes up to birth Parts of Embryology  General Embryology  Systemic Embryology 11/28/13 2
  3. 3. Stages of Development (Total 38-40 weeks)  Pre embryonic period: 1st – 2nd weeks Ovum fertilized, proliferates & give rise to Bilaminar germ layers  Embryonic period: 3rd -8th weeks Formation of trilaminar germ disc. 3 germ layers give rise to specific tissues & organs  Fetal period: 9 weeks – Birth Maturation of tissues, organs & rapid growth of body occurs 11/28/13 3

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