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Atlas of Xenopus Development by G. Bernardini

By G. Bernardini

Developmental biology draws scientists from many various components of biology, and the amphibian Xenopus holds a distinct position one of the organisms studied as a version of vertebrate improvement. earlier, no lately released atlas existed to help researchers and scholars coming to the Xenopus embryo for the 1st time.
The current booklet satisfies this want. With its synthesizing procedure and its beneficiant provision of gorgeous scanning, transmission, and lightweight microscopy photos, this detailed quantity might be a customary reference not just for developmental biologists yet for all scholars of embryology, histology, and comparative anatomy.

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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. The superficial layer forms the periderm, a temporary covering, which differentiates into several cellular types (Figs. 51-54). The epidermal pigment cells deriving from the neural crest differentiate beneath the ectoderm and soon become evident in characteristic regions of the body (Fig.

The transverse section of Fig. 22e is similar to the previous section, but for the absence of the liver diverticulum and of the nephrotomes. The midgut endoderm is extremely rich in yolk; 33 the yolky endoderm is the nutrient supply of the developing embryo. The detachment of the embryo skin is artefactual. The section of Fig. 22f is at the level of the proctodeum, an ectodermal invagination that meets with the endoderm of the hindgut. The section of Fig. 22g is through the tail; the dorsal and ventral fins are clearly evident.

In the following description, we will examine a sequence of sections of embryos at different developmental stages. 5 mm long. e. optic and otic vesides, cement gland, pro nephric tubules, prosencephalon, mesencephalon and rhombencephalon) are dearly evident in the histological sections of the embryo; the enteric cavity is surrounded by large cells rich in yolk. The yolk mass protrudes more and more into the median portion of the enteric canal, reducing it to a narrow transverse slit. The sections also show the hepatic diverticulum and a cardiogenic area.

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