BRS Embryology (Board Review Series) (5th Edition) by Ronald W. Dudek

By Ronald W. Dudek

BRS Embryology, 5th Edition is a succinct outline-format evaluate for USMLE and path assessments, with evaluation questions on the finish of every bankruptcy and a entire USMLE-style exam on the finish of the publication. The textual content outlines the real proof and ideas confirmed at the USMLE, in the context of human embryologic improvement. The booklet additionally comprises radiographs, sonograms, computed tomography scans, and pictures of varied congenital malformations. This version has been up to date and contains new, extra USMLE-style questions. medical photographs were put in the direction of the suitable textual content.

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Extra resources for BRS Embryology (Board Review Series) (5th Edition)

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Precardiac mesoderm is preferentially distributed to the splanchnic layer and is now called heart-forming regions (HFRs). C. As lateral folding of the embryo occurs, the HFRs will fuse in the midline to form a continuous sheet of mesoderm. D. Hypertrophied foregut endoderm secretes vascular endothelial growth factor (VEGF), which induces the sheet of mesoderm to form discontinuous vascular channels that eventually get remodeled into a single endocardial tube (endocardium). E. Mesoderm around the endocardium forms the myocardium, which secretes a layer of extracellular matrix proteins called cardiac jelly.

Qxd 11/01/2010 07:23 PM Page 45 Aptara Chapter 5 Cardiovascular System 45 the tricuspid valve. It results in a condition in which there is complete agenesis of the tricuspid valve, so that no communication between the right atrium and right ventricle exists. It is associated clinically with marked cyanosis and is always accompanied by the following: patent foramen ovale, interventricular septum defect, overdeveloped left ventricle, and underdeveloped right ventricle. 15A shows a tricuspid atresia defect.

Common atrium. RA ϭ right atrium; RV ϭ right ventricle; LA ϭ left atrium; LV ϭ left ventricle. Arrow shows the direction of blood flow. qxd 11/01/2010 07:23 PM Page 43 Aptara Chapter 5 Cardiovascular System 43 V. 11) A. Formation. The dorsal AV cushion and ventral AV cushion approach each other and fuse to form the AV septum. The AV septum partitions the AV canal into the right AV canal and left AV canal. 11. Formation of the atrioventricular (AV) septum. The AV septum partitions the atrioventricular canal.

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