By Jan E. Jirasek
Detailed, outstanding, accomplished, and unparalled - sure, it is all that and lots more and plenty, even more. broadly illustrated with greater than 500 colour and black-and-white photos, An Atlas of Human Prenatal Developmental Mechanics is the definitive consultant to trendy embryology. the writer describes and illustrates human prenatal improvement and staging on the subject of anatomy and discusses the opportunity of following prenatal improvement with medical tools of prenatal diagnostics. overlaying the advance and staging of all embryonic structures, he offers the anatomic framework in accordance with direct photographic facts got completely on human embryos and fetuses.
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Extra info for An Atlas of Human Prenatal Developmental Mechanics: Anatomy and Staging (Encyclopedia of Visual Medicine Series)
The segments are: the autopodium (hand plate, foot plate), the zeugopodium and the stylopodium. The hand and foot plates contain cartilaginous digital or toe rays and carpal primordia, the zeugopodium contains primordia of two bones (radius, ulna, or fibula, tibia), the axopodium a single bone (humerus or femur). Within limb plates the proximal phalanges appear earlier than the distal phalanges and the metacarpals and metatarsals earlier than carpals and tarsals. There is an ulnoradial gradient of retinoic acid determining the number and character of finger rays.
The cardiac jelly is rich in glycosaminoglycans. Within the primordia of the heart valves, this jelly is invaded by special mesenchymal fibroblasts originating from the endothelium. Most of them are of ectomesenchymal origin, from the mesenchyme of the first pharyngeal arches. The sympathetic and parasympathetic innervation of the heart is contributed by the cells of the neural crest also migrating through the pharyngeal arches. The coronary arteries are formed by angiogenesis from the proximal portion of the ascending aorta.
The origin of the inferior vena cava is as follows: (1) The subcardial segment (between the liver and the right atrium) is contributed by the right vitelline vein. (2) The hepatic segment is formed from the anastomosis between the right vitelline vein and the right subcardinal vein. (3) The renal segment originates from the right subcardinal and the left renal veins. The left renal vein is derived from the intersubcardinal anastomosis which receives the left suprarenal, left renal and left gonadal veins.