By G. Bernardini
Developmental biology draws scientists from many alternative components of biology, and the amphibian Xenopus holds a different 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 strategy and its beneficiant provision of lovely scanning, transmission, and lightweight microscopy photos, this certain 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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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.
The side view of the embryo(c) shows an incipient stomodeal depression and an external gill anlage (see enlargement in d) Atlas of Xenopus Development Fig. 27a, b. 28. Stereophotomicrograph of a 30-h-old embryo (x 45) 35 36 One-Day-Old Embryo Fig. 29a, b. SEM images of a 44-h -old embryo. In b the enlargement of the cephalic area shows the storno deal depression (1) as weil as the cernent gland (2) and the olfactory pit (3) (ax50, bx200) Atlas of Xe 11 op lIS Development 37 Fig. 30a-c. Another specimen of the same age as that in Fig.
430; the epithelium of the cloaca and of the anal tube has several ciliated cells (Fig. 43p). The section of Fig. 43q shows the hindlimb region. The hindlimb anlagen are the clearly defined masses of mesenchyme dorsal and lateral to the anal tube; as shown in the enlargement (Fig. 40a, b. Stereophotomicrographs of a 5-day-old larva. a dorsal view, b ventral view (x 10) 58 Five-Day-Old Larva buds. The narrow anal tube goes through the ventral fin (Fig. 43r) to connect the doaca to the exterior. The six frontal sections in Fig.