In this article we will discuss about:- 1. Meaning of Extraembryonic Structures in Chick Embryo 2. Formation of Yolk Sac and its Fate 3. Formation of Amnion and Serosa 4. Formation of Allantois. Meaning of Extraembryonic Structures in Chick Embryo: The embryo of chick possesses four extraembryonic or foetal membranes: namely, the yolk sac, the allantois, the amnion and the [...]
In this article we will discuss about:- 1. Meaning of Gastrulation 2. Basic Mechanism in Gastrulation 3. Methods 4. Morphogenetic Movement 5. Different Chordates 6. Analysis of Mechanism. Contents: Meaning of Gastrulation Basic Mechanism in Gastrulation Methods used to Study Gastrulation Morphogenetic Movement of Cells in Gastrulation Gastrulation in Different Chordates Analysis of Gastrulation Mechanism 1. Meaning of Gastrulation: The [...]
In this article we will discuss about:- 1. Meaning of Placenta 2. Types of Placenta 3. Organogenesis 4. Functions. Meaning of Placenta: The embryo, specially in eutherian mammals, becomes implanted to the uterine wall. The process of implantation involves tissue interaction and establishment of connection between the uterine wall and the extraembryonic membranes. The region of attachment between the embryonic [...]