Theory Biosci 2021 Jun 15. Epub 2021 Jun 15.
Laboratoire Matière et Systèmes Complexes, UMR 7057, Université de Paris/CNRS, 10 rue Alice Domont et Léonie Duquet, 75013, Paris, France.
We present in vivo observations of chicken embryo development which show that the early chicken embryo presents a principal structure made out of concentric rings and a secondary structure composed of radial sectors. During development, physical forces deform the main rings into axially directed, antero-posterior tubes, while the sectors roll up to form cylinders that are perpendicular to the antero-posterior axis. As a consequence, the basic structure of the chicken embryo is a series of encased antero-posterior tubes (gut, neural tube, body envelope, amnion, chorion) decorated with smaller orifices (ear duct, eye stalk, nasal duct, gills, mouth) forming at right angles to the main body axis. Read More