The marsupials have a yolk sac placenta (the initial stage in the development of the placenta in placental mammals. In placental mammals, the chorion and the allantois together form the fetal side of ...

Allantois Meaning in Arabic: Searching meanings in Arabic can be beneficial for understanding the context in an efficient manner. You can get more than one meaning for one word in Arabic. You have ...

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 ...

Cornified scales of reptiles increased their capacity to live in terrestrial environments. The stratum corneum is very thin, with little keratin. Skin is used for gas exchange. Thick keratin layer ...

The Revolutionary Story of Eggs, Evolution, and Life on Earth,” Mr. Howard makes a case for eggs so over easy that I can’t ...

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 ...

Influenza B virus (IBV) stands as a paradox, often overshadowed by its more notorious counterpart, influenza A virus (IAV). Yet, it remains a captivating and elusive subject of scientific inquiry.

Ultrasonography and CT scan demonstrated an infected urachal cyst which, following cystoscopy, was excised without complication. The urachus is the embryological remnant of the allantois, which ...

The angiopoietin (ANGPT)–TIE system is crucial for the angiogenic switch in tumours, and together with vascular endothelial growth factor A (VEGFA) promotes the initiation of angiogenesis and ...

In mouse embryo gastrulation, epiblast cells delaminate at the primitive streak to form mesoderm and definitive endoderm, through an epithelial-mesenchymal transition. Mosaic expression of a membrane ...

Epithelial fusion is a crucial process in embryonic development, and its failure underlies several clinically important birth defects. For example, failure of neural fold fusion during neurulation ...