What really is "Prechordal Plate"?

25 November 2020 1 9K Report

There is too much discrepency among the textbooks of vertebrate embryology. There are two interpretations of the term "Prechordal plate" in different books:

It is the cranial most part of the endoderm, where endoderm consists of columnar cells and is tightly stitched together with the overlying ectoderm with no intervening mesoderm. It forms the enoderm of the oropharngyeal membrane

It consists of earliest mesodermal cells that migrate through the Henson or Primitive node. It lies cranial to the notochod and is a discerete mass of cells.

Both of these concepts contradict each other. which one is actually true?

Ellen A G Chernoff

The problem is that researchers have disagreed on the most cranial limit of the prechordal plate, based on experimental differences. These days in mammals, at least, an endodermal component is generally accepted, and increasingly it is included for all vertebrates.

https://discovery.lifemapsc.com/in-vivo-development/primitive-streak/prechordal-plate

https://zfin.org/GO:0021501

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