Download Atlas of Xenopus Development by G. Bernardini PDF

By G. Bernardini

Developmental biology draws scientists from many alternative components of biology, and the amphibian Xenopus holds a distinct position one of the organisms studied as a version of vertebrate improvement. beforehand, no lately released atlas existed to help researchers and scholars coming to the Xenopus embryo for the 1st time.
The current publication satisfies this desire. With its synthesizing method and its beneficiant provision of lovely scanning, transmission, and light-weight microscopy pictures, this specific quantity can be a typical reference not just for developmental biologists yet for all scholars of embryology, histology, and comparative anatomy.

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With the closure of the neural tube the eye anlagen become lateral pockets called optic or eye vesicles (Fig. 22b). As they grow outward and invaginate to become optic cups, their connection with the diencephalic region of the prosencephalon narrows to form the optic stalks. The optic vesicles come into contact with the ectoderm sensorial layer, where the lens placodes have formed (Fig. 25). These ectodermal differentiations detach to take up their position in the optic cups and, developing a transitory cavity, become lens vesicles.

The section in Fig. 32e cuts through the otic vesicles, Fig. 31. Stereophotomicrograph of a 2-day-old larva (x 19) shows the parachordal cartilages beside the notochord and grazes the cardiogenic area, which can be better seen in Fig. 32f. Progressing caudally (Fig. 32g), the pronephric tubules are encountered. Ventrally is the liver diverticulum of the foregut. In a more caudal section (Fig. 32h) the midgut is just a small slit surrounded by the yolky endodermal cells; the lateral mesoderm is evident around the endoderm.

Later in the development (stage 39, 55 h) a large symmetrieal structure (velar plate, ventral velum or primitive tongue) develops on the pharyngeal floor (Figs. 43b,c, 44e, 46-48). This structure,less evident in other anurans, is characterized by parallel ridges that under electron mieroscopy (Fig. 48) show stubby mierovilli. At the posterior end of this structure the pharynx constriets to form the oesophagus. The lungs, too, derive from the digestive tube. In the centre of the pharyngeal floor at the posterior end of the velar plate, a ventral groove forms and deepens, becoming a tube, and bifurcates to form the bronchi and lungs.

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