By Jan E. Jirasek
Designated, extraordinary, complete, and unparalled - certain, it is all that and lots more and plenty, even more. generally illustrated with greater than 500 colour and black-and-white photographs, An Atlas of Human Prenatal Developmental Mechanics is the definitive advisor to trendy embryology. the writer describes and illustrates human prenatal improvement and staging just about anatomy and discusses the opportunity of following prenatal improvement with scientific tools of prenatal diagnostics. masking the advance and staging of all embryonic platforms, he offers the anatomic framework in line with direct photographic facts acquired solely on human embryos and fetuses.
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Additional info for An Atlas of Human Prenatal Development Mechanics: Anatomy And Staging
As the roots of the primitive umbilical arteries become replaced by a secondary connection to the more caudally located parietal aortic branches, the newly formed connection transforms into the common iliac artery. Each common iliac artery branches into the internal and external iliac arteries. Consequently, umbilical arteries become branches of the internal iliac arteries. After birth, the umbilical arteries become obliterated. Intermedial branches of the descending aorta are the abdominal phrenic arteries, suprarenal arteries, renal arteries and internal spermatic (or ovarian) arteries.
The fifth aortic arches disappear. Ventral portions of the left sixth aortic arch changes into the pulmonary artery. The dorsal portion of the right sixth aortic arch disappears while the left portion persists and changes into the pulmonary artery and the arterial duct (of Botallus), connecting the left pulmonary artery with the proximal portion of the descending aorta. After birth, after the pulmonary circulation has been established, the arterial duct is obliterated and changes into the ligamentum arteriosum.
The umbilical vessels close and obliterate after the placenta has been removed and the umbilical cord is clamped. The venous duct obliterates, contributing the ligamentum teres of the liver. The umbilical arteries change into the lateral umbilical ligaments. The oxygenated blood from the lungs comes to the left atrium of the heart by way of the pulmonary veins, passes to the left ventricle and is distributed throughout the body and organs of the newborn through the arteries, beginning with the aorta.