The urachus is an intra-abdominal fibrous remnant of the allantois. The non-involution of the allantois can result in urachal anomalies. The abnormal appearance of the umbilicus may be a sign of such ...

The fetal membranes consist of the chorion, amnion, yolk sac, and allantois. The chorion has three layers: cytotrophoblastic, chorionic connective tissue, and basement membrane. The chorion lies ...

The age-old debate of whether the chicken or the egg came first is explored through historical and evolutionary contexts.

Uncover the fascinating history of eggs and chickens, exploring the evolutionary journey and scientific debate surrounding the age-old question: which came first?