By Jan E. Jirasek
Distinctive, striking, finished, and unparalled - certain, it is all that and masses, even more. widely illustrated with greater than 500 colour and black-and-white photos, An Atlas of Human Prenatal Developmental Mechanics is the definitive advisor to trendy embryology. the writer describes and illustrates human prenatal improvement and staging with regards to anatomy and discusses the potential for following prenatal improvement with medical tools of prenatal diagnostics. masking the improvement and staging of all embryonic platforms, he offers the anatomic framework in accordance with direct photographic proof got completely on human embryos and fetuses.
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Additional resources for An Atlas of Human Prenatal Development Mechanics: Anatomy And Staging
In young embryos (during the 4th and 5th week, stages 6-3; 7) there are three important circulations: (1) The intraembryonic circulation supplying the intraembryonic tissues with nutrients and mediating gas exchange (O2, CO2) (in early embryos, germ layers are nourished by diffusion); (2) The yolk sac circulation supplying the first erythroblasts and myeloblasts to the embryo; (3) The umbilical circulation connecting the embryo with the chorion, mediating the embryonic– maternal and maternal–embryonic metabolic exchange.
The inferior vena cava brings to the heart a mixed, predominantly oxygenated blood. In the right atrium of the heart, the blood from the inferior vena cava mixes with venous blood from the superior vena cava. From the right atrium, most of the mixed blood goes through the foramen ovale into the left atrium (interatrial shunt) and the left ventricle, bypassing the right ventricle, and continues from the left ventricle into the aorta. A smaller portion of mixed blood enters the right ventricle and becomes divided into two streams: a small stream entering the pulmonary nutritive circulation, and a second, which passes through the arterial duct (of Botallus) from the pulmonary artery into the aorta (pulmonary-aortic shunt).
The closure of the soft palate in male fetuses occurs earlier than in female fetuses. Within the oral cavity the ecto–endodermal border is indistinct. The epithelial lining of the nasal cavity and palate, as well as the enamel of the teeth, are ectodermal and neuroectodermal derivatives. The salivary glands, formed from epithelial buds growing into branching cords, as well as the lining of the tongue, are considered to be endodermal in origin. 84) The lower jaw originates from the mandibular primordia of the first pharyngeal arches, fusing into a single mandibular arch.
An Atlas of Human Prenatal Development Mechanics: Anatomy And Staging by Jan E. Jirasek