In this article we will discuss about the formation of placenta in oryctolagus, explained with the help of a suitable diagram. Changes in the Embryo: 1. After fertilization the zygote descends in the oviduct, undergoes cleavage, and a blastocyst, corresponding to the blastula of lower forms is produced. 2. The epiblast formed during gastrulation is differentiated into an inner cell [...]
In this article we will discuss about the Placenta:- 1. Meaning of Placenta 2. Types of Embryonic Tissues Involved in Placentation 3. Function. Meaning of Placenta: In mammals although the fertilized ovum develops in the body of the mother, the extra embryonic membranes are formed in similar fashion like that of the birds. The extra-embryonic somatopleure contributes to the formation [...]
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 [...]