File:Abatus cordatus Post-gastrular stage.jpg
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| Description | Figure 8. Post-gastrular stage of Abatus cordatus. (A) Developing vestibule of a newly hatched embryo (SEM). (B) Cross section through the animal part of an 80-day-old embryo. The vestibule is isolated from the embryonic epithelium and has grown in the mesenchyme. Future primary podia differentiate on the floor of the oral cavity (external fold). At this stage the future nervous system begins to be visible (internal fold). The embryonic gut is suspended in the coelomic cavity by mesenteries. (C) Cross section of a 100day-old embryo. The vestibule is at its maximal size. (D) Detail of the black box in Fig. 8b showing an outgrowth (arrow) of the ceiling of the vestibule towards the external epithelium. (E) Late embryo (110 days old). The vestibule has opened (arrow). Details of the oral-surface-like buds of podia or spines are visible through its very thin ceiling (light micrograph). (F) Cross section through the opening (arrows) of the vestibule of a 100-day-old embryo. B to D are semi-thin plastic sections (toluidine blue, pH 11.5). F is an autoradiographic semi-thin plastic section (toluidine blue, pH 11.5; see Schatt, 1988). Abbreviations: amp, primary podia: ap, animal pole; cc, coelomic cavity; de, endoderm that will give the digestive epithelium; dl, digestive lumen; ect, ectoderm; em, embryo; eme, embryonic epithelium; m, mesentery; mes, mesenchyme; V, vestibule; vp, vegetal pole. Scale bar = A, 100 um; B and F, 250 um; C and E, 500 um; D, 10 um. |
| Date | |
| Source | https://archive.org/details/biologicalbullet1901996lill/page/35/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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| current | 18:25, 25 March 2024 | | 930 × 1,284 (1.04 MB) | Rasbak (talk | contribs) | {{information |description=Figure 8. Post-gastrular stage of Abatus cordatus. (A) Developing vestibule of a newly hatched embryo (SEM). (B) Cross section through the animal part of an 80-day-old embryo. The vestibule is isolated from the embryonic epithelium and has grown in the mesenchyme. Future primary podia differentiate on the floor of the oral cavity (external fold). At this stage the future nervous system begins to be visible (internal fold). The embryonic gut is suspended in the coelo... |
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