Vitelline circulation is the process of transporting nutrients and oxygen to the developing embryo in an egg through the yolk sac. Some synonyms for vitelline circulation include yolk sac circulation, umbilical circulation, and embryonic circulatory system. Another synonym for vitelline circulation is the chorio-allantoic membrane, which works in conjunction with the yolk sac to nourish and oxygenate the developing embryo. These terms are commonly used in the field of developmental biology and are important for understanding the intricacies of embryonic growth and development. Understanding the different synonyms for vitelline circulation is crucial for researchers and scientists who are working to better understand embryonic development and its many complex processes.