To discuss:
The mode of trophoblastic nutrition; what the trophoblast digest for its nourishment at this stage; the developmental age at which this yields to the placenta as the dominant mode of nutrition; and the age at which it ends entirely.
Introduction:
A single cell–fertilized egg is transformed into a fully developed and independent individual. It is a miraculous and one of the most important aspects of human life. Embryology is a branch of science that deals with the study of prenatal development. Now, embryology is a part of developmental biology. The developmental biology deals with the changes that occur during development as well as the functions of a fertilized egg from fertilization to old age.
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Anatomy & Physiology: The Unity of Form and Function
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- A Survey of Human Development from Fertilization to Birth 4. The gestation of a fetus occurs over 9 months and is divided into three trimesters. Describe the major events that occur in each trimester. Is there a point at which the fetus becomes more human?arrow_forwardThe organization and function of placenta.arrow_forwardWhat happens to the fetus in terms of growth during the 2nd and 3rd trimesterarrow_forward
- Arrange the cytoplasmic rearrangement of the fertilized egg of the tunicate, Styela partita in consecutive order. (I) After sperm entry into the vegetal hemisphere of the oocyte, the yellow cortical cytoplasm and the clear cytoplasm derived from the breakdown of the oocyte nucleus contract vegetally toward the sperm.(II) Before fertilization, yellow cortical cytoplasm surrounds the gray (yolky) inner cytoplasm. (III) The final position of the yellow cytoplasm marks the location where cells give rise to tail muscles.(IV) As the sperm pronucleus migrates animally toward the newly formed egg pronucleus, the yellow and clear cytoplasm move with it.arrow_forwardGastrulation in birds and mammalsarrow_forwardpregnancy and the physiological changes taking place in the mother in details woth proper diagramarrow_forward
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