By Jan E. Jirasek
Particular, awesome, complete, and unparalled - convinced, it is all that and lots more and plenty, even more. widely illustrated with greater than 500 colour and black-and-white pictures, An Atlas of Human Prenatal Developmental Mechanics is the definitive consultant to fashionable embryology. the writer describes and illustrates human prenatal improvement and staging almost about anatomy and discusses the potential for following prenatal improvement with scientific tools of prenatal diagnostics. protecting the advance and staging of all embryonic structures, he offers the anatomic framework in response to direct photographic facts received completely on human embryos and fetuses.
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Extra info for An Atlas of Human Prenatal Development Mechanics: Anatomy And Staging
The single primitive atrioventricular canal becomes divided into right and left portions. Laterally, in the right atrioventricular canal an additional endocardial cushion is formed. Endocardial cushions change into cusps of valves. In the right atrioventricular canal, the tricuspid valve becomes evident, while in the left canal the mitral (bicuspid) valve appears. Atria and their septation During the 5th week, the auricles of both atria appear. As the right atrium enlarges, the venous sinus becomes incorporated.
The apex of the nose is formed, and the median notch separating both premaxillary portions of nasal ridges is filled with mesenchyme located in the midline over the nasal capsule. This mesenchyme contributes the phrenulum of the philtrum of the upper lip, and closes the midline of the upper lip. The primary palate is completely closed at stage 8–1 early in the 8th week (10th gestational week). Mesenchyme located over the nasal capsule is dermal in origin. 7). The lower jaw and lip are formed by the first pharyngeal arches, which fuse to the mandibular arch in embryos at stages 7–2 to 7–4 during the 5th developmental week.
The thymus originates from endodermal epithelium derived from the ventral portion of the third pharyngeal pouches and from immigrated lymphocytes (T cells). Ectodermal epithelium from the third pharyngeal obturatory membrane adjacent to the thymic endoderm and ectomesenchyme participate in thymic histogenesis, contributing Hassal’s corpuscles. The epithelium from the third pharyngeal pouches forms two elongated thymic primordia which separate from the pharynx, descend anteriorly to the trachea and become apposed to each other.