In this article we will discuss about the Extra-Embryonic Membranes in Chick:- 1. Meaning of Extra-Embryonic Membranes in Chick 2. Kinds of Extra-Embryonic Membranes 3. Development 4. Functions. Meaning of Extra-Embryonic Membranes in Chick: During the development of chick and other vertebrates, certain specialized embryonic tissues or structures are produced that temporarily or permanently do not enter into the formation [...]
The below mentioned article provides a study note on the Placentation in Human. Implantation of Placenta in Human: When the developing human egg following fertilization, reaches the uterus it is still surrounded by the zona pellucida and the corona radiata. The blastocyst remains free and floating within the uterus for about four days. During this time it maintains itself through [...]
The following points highlight the four main types of classification of placenta. The types are: 1. Classification Based on the Degree of Intimacy 2. Classification Based on the Types of Implantation 3. Classification Based on the Distribution of Villi 4. Classification Based on the Degree of Involvement of Foetal and Maternal Tissues. Classification of Placenta: Classification Based on the Degree [...]