In the embryonic stage ::
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Embryonic Stage. At the age of four weeks, the embryo is about the size of a pea. The maternal and embryonic blood supplies meet at this organ, but the blood does not mix. Instead, diffusion accounts for the passage of gases, nutrients, and waste products across the membranous barriers. The embryonic stage of gestation is the period after implantation, during which all major organs and structures within the growing mammal are formed. Once the embryo is fully formed, it expands, grows and continues to develop into what is known as the stage of fetal development. This is when the mother becomes physically and visibly pregnant.

Psychology Definition of EMBRYONIC STAGE: In humans it is about the 6 week period where the 3 layered embryo develops. This stage begins when the cell differentiation is in the last stagese The embryo is now called a fetusu The neural tube begins to developo This marks the start of the embryonic brain developmentn Other organs like the spinal chord and the rest of the nervous system develops fullyl Embryonic heart development also begins during this stageg In.

The embryonic stage is short, lasting only about seven weeks in total, but developments that occur during this stage bring about enormous changes in the embryo. During the embryonic stage, the embryo becomes not only bigger but also much more complex. The figure below shows early- and late-stage embryos for comparison. As the embryonic development goes on, the placenta will become a kind of protective membrane. At the end of the 8 th week of pregnancy the baby is entirely surrounded by it. The amniotic fluid found inside this membrane protects the baby when the mother moves or when accidents happen to her. Throughout this chapter, we will express embryonic and fetal ages in terms of weeks from fertilization, commonly called conception. The period of time required for full development of a fetus in utero is referred to as gestation gestare = “to carry” or “to bear”. It. Start studying The embryonic stage. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

Pre-embryonic Stage The pre-embryonic stage is the first two weeks of development after fertilisation and involves three major processes: a cleavage, b implantation, c embryogenesis. a Cleavage refers to the rapid mitotic divisions within the first 3 days. Start studying Embryonic Stage of Pregnancy. Learn vocabulary, terms, and more with flashcards, games, and other study tools. The Stages of Human Embryonic Development. As the description of each stage is based on the features seen in an "average" embryo individual embryos may not fit exactly into a particular stage. There may also be considerable variation within a stage.

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