Atlas of Xenopus Development by G. Bernardini

By G. Bernardini

Developmental biology draws scientists from many alternative components 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 help researchers and scholars coming to the Xenopus embryo for the 1st time.
The current booklet satisfies this desire. With its synthesizing process and its beneficiant provision of gorgeous scanning, transmission, and light-weight microscopy photos, this precise quantity should be a regular reference not just for developmental biologists yet for all scholars of embryology, histology, and comparative anatomy.

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45-47. Further details are revealed by transmission electron microscopy (Fig. 48). The pharynx is surrounded by muscle fibres and by cartilaginous structures. An in toto view of the cartilaginous skeleton can be seen in the specimens shown in Fig. 49. The cross-section of Fig. 43d cuts the tadpole at the level of the he art. Dorsally is the rho mb encephalon with its thin roof of the fourth cerebral ventricle. Alongside the notochord there are cartilaginous structures, the parachordal cartilages.

The otic placodes are derived from the ectoderm near the rhombencephalon. They separate from the ectoderm forming two large vesicles, the otic vesicles (Figs. 22c, 32e, 35e, 43d). Cement Gland A thickening of the ectoderm at stage 19-20, corresponding to the oral evagination of the foregut, is the first histological evidence of the formation of the cement gland. The cement gland is also called the adhesive gland, mucous gland or oral sucker. The gland begins to protrude at stage 23 (Fig. 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.

Mech Dev 75: 127-137 Chalmers AD, Slack JMW (1998) Development of the gut in Xenopus laevis. Dev Dyn 212: 509-521 Gammill LS, Sive H (1997) Identification of otx2 target genes and restrictions in ectodermal competence during Xenopus cement gland formation. Development 124: 471-481 Icardo JM (1996) Developmental biology of the vertebrate heart. J Exp Zoo1275: 144-161 Lyerla TA, Pelizzari JJ (1973) Histological development of the cement gland in Xenopus laevis: a light microscopic study. J Morpho1141: 491-501 Nascone N, Mercola M (1996) Endoderm and cardiogenesis: new insights.

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