File:Aves Diagrams depicting the early stages of chick development.jpg

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Fig. 1. Diagrams depicting the early stages of chick development.

The upper row of diagrams shows embryos at stages XI-XIV (pre-primitive streak), 2 (early streak), 3 (mid-streak) and 3+ (mid- to late streak), viewed from the dorsal (epiblast) side. The arrows denote the main morphogenetic movements (‘Polonaise’) occurring within the plane of the epiblast. After stage 4 (end of gastrulation), convergence of cells towards and ingression through the anterior part of the streak slows down or ceases (although these movements continue through the middle and posterior parts of the streak), while the epiblast anterior to the streak (prospective neural plate) elongates (Sheng et al., 2003); later, the streak starts to regress, further lengthening the neural plate posteriorly (Spratt, 1947). The lower row of diagrams shows an exploded view of the embryos at each of the above stages, with the top row of diagrams representing the upper layer (epiblast, shades of yellow), the bottom row showing the lower layer (shades of blue/green: hypoblast in dark green, endoblast in light green, definitive or gut endoderm in blue) and the centre row showing the middle (mesodermal) layer (primitive streak, in red). Within the epiblast, the central (yellow) region is the area pellucida and the outer (mustard) region the extraembryonic, area opaca.
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Source https://doi.org/10.7554/eLife.01817 Local cell interactions and self-amplifying individual cell ingression drive amniote gastrulation eLife 3:e01817.
Author Octavian Voiculescu Lawrence Bodenstein I-Jun Lau Claudio D Stern
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© 2014, Voiculescu et al.

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current17:05, 16 April 2024Thumbnail for version as of 17:05, 16 April 20241,500 × 922 (152 KB)Rasbak (talk | contribs){{Information |description=Fig. 1. Diagrams depicting the early stages of chick development.<br> The upper row of diagrams shows embryos at stages XI-XIV (pre-primitive streak), 2 (early streak), 3 (mid-streak) and 3+ (mid- to late streak), viewed from the dorsal (epiblast) side. The arrows denote the main morphogenetic movements (‘Polonaise’) occurring within the plane of the epiblast. After stage 4 (end of gastrulation), convergence of cells towards and ingression through the anterior part...

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