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A developing human is referred to as an embryo during weeks 3–8, and a fetus from the ninth week of gestation until birth. In this section, we’ll cover the pre-embryonic and embryonic stages of development, which are characterized by cell division, migration, and differentiation.
This lecture will discuss the first two weeks of human embryogenesis and describe the cleavage stages, blastocyst formation and hatching, and the generation of the bilaminar embryo. There will also be an introduction to the uterine changes at implantation, that will be covered in detail in the placentation lecture.
This lecture is going to take you briefly through key biological concepts in human development, these will later be explored in more detail through the BGD course. I will be using simplified terms in the lecture slides (with developmental term in. This Lecture is under revision for 2012. brackets).
Use this interactive prenatal timeline to learn about the stages of pregnancy from conception to birth. This versatile tool features movies, images, facts, and even quiz questions.
26 lip 2023 · The first week of embryonic development is filled with an eclectic arrangement of physical and biochemical changes. Each step is a part of a cascade of events that must be intricately coordinated in order to produce a healthy baby at the end of the thirty eight to forty week period.
The first IVF child was born in Sweden in 1982. In early 1990s the number of embryos transferred to the uterus during IVF was reduced from 3 to 2. At present, the number of embryos transferred is being reduced further, from 2 to 1. K ll n et al BMJ 2005;331:382-383 Rate of twins in Sweden
Understand key events in development of the human embryo during the first trimester. Key Concepts: Adplantation, implantation, uterine changes, early placentation syncitiotrophoblast, cytotrophoblast,
