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 help researchers and scholars coming to the Xenopus embryo for the 1st time.
The current ebook satisfies this want. With its synthesizing method and its beneficiant provision of gorgeous scanning, transmission, and lightweight microscopy photographs, this distinct 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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Extra resources for Atlas of Xenopus Development
36b) clearly reveals the shape of the pigmented ceHs. The olfactory pit is rostral to the highly pigmented eye, while caudal to it the otic capsule appears as a translucent white spot. The mouth, just opened, is visible between the 01factory pit and the protruding cement gland. The external gills are not so evident as in Fig. 34 a-c. Note the proctodeum, perpendicular to the tail, which, together with the absence of the postanal gut, is an useful element by which to stage a larva of this age. The tail has a dorsal and a ventral fin.
The heart develops in an anterior position just underneath the pharynx; only later does it move to the chest. While the embryo is undergoing neurulation, the prospective heart mesoderm detaches from the endoderm, forming a cavity harbouring some mesenchymal cells that will form the endocardium (Fig. 22c). The splanchnic mesoderm surrounds the mesenchymal cells and fuses medially to form the myocardium and epicardium. The somatic mesoderm forms the pericardium. In a 72-h-old tadpole the he art tube is twisted and weIl differentiated (Fig.
The few mesenchymal cells that give origin to the endocardium are visible in a flat cavity ventral to the pharynx. a Fig. 22a-g. Transverse histological sections of a I-day-old embryo (b-g), cut as shown in a (x l30). 1, Cement gland; 2, diencephalon; 3, dorsal fin; 4, double-Iayered epidermis; 5, endoderm; 6, endodermal yolk mass; 7, eye veside; 8, gut; 9, head mesenchyme; 10, hindgut; 11, hypochord; 12, liver diverticulum; 13, mesencephalon; 14, mesenchymal cells giving origin to the endocardium; 15, midgut; 16, neurocoel; 17, notochord; 18, oral plate; 19, otic veside; 20, parachordal cartilage; 21, pharynx; 22, proctodeum; 23, pronephric anlage; 24, Rathke's pouch; 25, rombencephalon; 26, somatic mesoderm; 27, somite; 28, spinal cord; 29, splanchnic mesoderm; 30, ventral fin Atlas of Xenopus Development 29 30 One-Day-Old Embryo Atlas of Xenopus Development 31 ...