Atlas of Xenopus Development by G. Bernardini

By G. Bernardini

Developmental biology draws scientists from many various parts of biology, and the amphibian Xenopus holds a unique position one of the organisms studied as a version of vertebrate improvement. before, no lately released atlas existed to assist researchers and scholars coming to the Xenopus embryo for the 1st time.
The current booklet satisfies this desire. With its synthesizing procedure and its beneficiant provision of gorgeous scanning, transmission, and lightweight microscopy pictures, this specified quantity should be a typical reference not just for developmental biologists yet for all scholars of embryology, histology, and comparative anatomy.

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Figures 37-39 give an overview of the external morphological development of a larva at this stage. Atlas of Xenopus Development Fig. 39a, b. SEM image of a 4-day-old larva head; b shows a detail of the floor of the mouth opening (a x 220, b x 700) 55 Five-Day-Old Larva Five-day-old tadpoles (stage 47) are approximately 12 mm long. All sense organs are now weIl differentiated. External gills have regressed and the internaIones are protected by an operculum. The cement gland, now unpigmented, is in regression (Fig.

Figure 27 provides a detail of the ventral fin ending at the anus level. An image from the stereomicroscope shows an embryo of the same stage (Fig. 28). Note the transparent fin, the somites and the protruding pigmented cement gland. "'--- 2 Fig. 25. Histological seetion of the forming eye of a 28-h-old embryo (x 190). 1, Optic vesicle; 2, lens placode 34 One-Day-Old Embryo Fig. 26a-d. SEM images of a 30-h-old embryo (a x 140, b x 1000, c x 100, d x 500). In a the cranial portion is clearly visible: note the anlagen of the cement gland and the olfactory pits (see enlargement in b).

22b). Later it becomes a well-defined organ, clearly visible under the stereoscopic micro- 26 scope, where it appears as a pigmented conical protrusion (Figs. 28, 29, 30a-c). Cellular organization is clearly visible in Figs. 35b,c, 36, 41 b-d. Eventually, the first indication that the organ has started its regression is the dispersion of the concentrated pigment (Fig. 41c). Skin At the end of gastrulation, the ectoderm covering the embryo forms a double layer. Later in the development, the inner layer (sensorial or basal layer) thins down, becoming a squamous epithelium that will give origin to the stratum germinativum of the epidermis.

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