This sqadia.com video clip is a brief explanation of Vasculogenesis and Angiogenesis.
Angioblasts aggregate to form isolated angiogenic cell clusters or angiogenic cords. The angioblasts flatten to form endothelial cells. Because of hemodynamic and genetic factors, certain channels enlarge to form blood vessels and channels connected to them form branches or tributaries. Vessels sprout into the adjacent areas by endothelial budding and fuse with other vessels.