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Description Figure 6. Gastrulation of Abatus cordatus. (A) Young gastrulae (32 days old) viewed from the animal pole (left) and from the side (right). The perivitelline space is filled with cells (see a nucleated cell, Fig. 6B) that migrate towards the blastopore, forming a lateral cap on half of the surface of the embryo. Arrows show the limits of the lateral cap. (B) 45-day-old gastrula surrounded by the largest number of migrating cells. Its diameter is about half the diameter of the fertilization membrane. (C) More advanced gastrula (60 days old). It takes up all the available room within the fertilization membrane. The fertilization membrane and the embryo are in contact; there is only a virtual perivitelline space, devoid of migrating cells. At the level of the blastopore, migrating cells aggregate into a vitelline plug. (D) Hatching of the gastrula, 65 days after fertilization. A to D are videotape frames. Abbreviations: em, embryo; fm, fertilization membrane; mc, migrating cells; vpl, vitelline plug. Scale bar = 500 um
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Source https://archive.org/details/biologicalbullet1901996lill/page/33/mode/1up?view=theater The Biological bulletin. Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press.
Author Lillie, Frank Rattray, Moore, Carl Richard, Redfield, Alfred Clarence.

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current15:31, 25 March 2024Thumbnail for version as of 15:31, 25 March 20241,037 × 843 (673 KB)Rasbak (talk | contribs){{information |description=Figure 6. Gastrulation of Abatus cordatus. (A) Young gastrulae (32 days old) viewed from the animal pole (left) and from the side (right). The perivitelline space is filled with cells (see a nucleated cell, Fig. 6B) that migrate towards the blastopore, forming a lateral cap on half of the surface of the embryo. Arrows show the limits of the lateral cap. (B) 45-day-old gastrula surrounded by the largest number of migrating cells. Its diameter is about half the diamet...

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