By Jan E. Jirasek
Designated, extraordinary, finished, and unparalled - sure, it is all that and lots more and plenty, even more. greatly illustrated with greater than 500 colour and black-and-white photographs, An Atlas of Human Prenatal Developmental Mechanics is the definitive consultant to trendy 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. masking the advance and staging of all embryonic platforms, he provides the anatomic framework in keeping with direct photographic facts got solely on human embryos and fetuses.
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Additional info for An Atlas of Human Prenatal Development Mechanics: Anatomy And Staging
Germ cells pass genes between generations. NOTOCHORDOBLAST (LAYER OF AXIAL ORGANIZATION) The notochordal tubule is formed by special cells with properties different from the mesoderm. The notochordal tubule transforms into the notochordal plate. The notochordal plate induces the neuroepithelial differentiation of the overlying ectoderm into the medullary primordium (neural groove) and consequently influences formation of the ventral plate of the neural tube, and delineation of the surface ectoderm and neuroectoderm.
The right umbilical vein soon obliterates. The vein forms a large anastomosis with the portal vein (portal sinus) and runs as a large canal, venous duct of Arantius, on the ventral side of the liver. The venous duct opens into the inferior vena cava. After birth the venous duct obliterates and changes into a band of connective tissue—the hepatic ligamentum teres. 2 Morphogenesis of the spleen Stage or CRL Gestational weeks Mesenchymal condensation (anlage) within the dorsal stage 7–4 9 mesogastrium Vascularized mesenchyme, T lymphocytes present CRL 30–1 00 mm 10–15 Capsule, trabecules, reticulum, hematopoietic tissue; B CRL 1 00–200 mm 16–22 lymphocytes present Red and white pulp distinct, penicillate arteries; CRL 200–350 mm 23–40 erythropoiesis Erythropoiesis in the spleen ceases before birth, while lymphopoiesis within the white pulp continues during entire life.
Erythropoiesis and myelopoiesis in the bone marrow begin at the end of the 3rd month and during the 4th month (clavicle of 40 mm crown-rump length (CRL) fetuses, humerus of 60 mm CRL fetuses and femur of 70–80 mm CRL fetuses). 4). From the hematopoietic tissue of liver erythroblasts, erythrocytes and thrombocytes are predominantly released. From the bone marrow (in normal fetuses) originate erythrocytes, megalocytes and B lymphocytes. There are four successive stages of hematopoiesis: (1) (2) (3) (4) Yolk sac hematopoiesis (weeks 3–8); Liver hematopoiesis (weeks 6–28); Spleen, lymph nodes and thymus hematopoiesis and lymphopoiesis (from the 12th week); Bone marrow hematopoiesis (from the end of the 3rd month) and lymphopoiesis in lymph nodes, thymus and spleen (from the 14th week).
An Atlas of Human Prenatal Development Mechanics: Anatomy And Staging by Jan E. Jirasek