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The Clinical Anatomy of the Vascular System | Ch 50
The lymphatic system begins to take form in the human embryo at approximately the sixth week of development. This primordial system appears as a collection of six lymph sacs: two jugular lymph sacs, two iliac lymph sacs, the cisterna chyli, and the retroperitoneal lymph sac. They all originate from the mesoderm and are extensions of veins, being similarly lined with endothelium. Eventually, the lymphatic sacs give rise to a network of lymph nodules interconnected via endothelium-lined channels, establishing the early lymphatic system in the human embryo
The Clinical Anatomy of the Vascular System | Ch 29
During the third week of gestation, the aorta develops along with the endocardial tube. The very early aorta has dorsal and ventral segments that are associated with the first aortic arch. This arch later regresses. The ventral segments form the aortic sac, while the dorsal segments form the descending aorta. Six paired aortic arches form during embryogenesis. The right dorsal aortic root subsequently regresses, which leads to the formation of the physiologically normal left-sided aorta (Murillo et al. 2012)