Cardiovascular_System Wk10

Cardiovascular_System Wk10 - Development of the...

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Unformatted text preview: Development of the Cardiovascular System Early Cardiovascular Development Diffusion is no longer sufficient to nourish the entire embryo Angiogenesis: formation of blood vessels Begins in extraembryonic mesoderm (yolk sac, connecting stalk, chorion) Heart and vascular system appear 3 rd week Begins to function 4 th week 1 st major system to be functional Early Blood Vessel Formation Angioblasts (mesenchyme) aggregate to form blood islands Islands hollow out Angioblasts flatten and form endothelial cells that line cavities The cavities fuse to form channels (vessels) Vessels grow by fusing with other channels and endothelial budding Hematopoiesis Early blood cells form from endothelial cells (yolk sac and allantois) Embryo: blood cells are formed in embryonic mesoderm (liver), spleen, bone marrow and lymph nodes Early Heart Paired endocardial heart tubes form from mesenchyme at the cardiogenic area The paired tubes fuse to form one primordial heart tube Derived from Splanchnic mesoderm heart Paraxial and lateral mesoderm Neural crest cells At the beginning (3 rd week) Paired angioblastic cords Canalize to form heart tubes which then fuse Beats at 22-23 days Blood begins flowing week 4 Veins associated with the heart All enter the Sinus venosus Vitelline (refers to yolk sac)...
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This note was uploaded on 11/21/2011 for the course ANAT 1502 taught by Professor Johnh.romfh during the Spring '10 term at Life Chiropractic College West.

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Cardiovascular_System Wk10 - Development of the...

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