Discuss the process of development of extra embryonic membranes in chick.

The development of extraembryonic membranes in chicks is an essential aspect of avian embryology. These membranes support the embryo by providing protection, nutrition, respiration, and waste management during its development. In chicks, there are four primary extraembryonic membranes: yolk sac, amnion, chorion, and allantois. These membranes are derived from embryonic tissues and develop in coordination with the growth of the embryo.  

### Yolk Sac  
The yolk sac is the first extraembryonic membrane to develop in the chick embryo. It forms from the splanchnopleure, a layer consisting of mesoderm and endoderm. Initially, the yolk sac envelops the yolk, which serves as the primary source _______ __________ ___ _________ ______ _______.
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