Tags: Anatomical Structure, Embryology.
Lymph sacs are a part of the development of the human lymphatic system known as lymphangiogenesis. The lymph sacs are precursors of the lymph vessels. These sacs develop through the processes of vasculogenesis and angiogenesis. However there is evidence of both of these processes in different organisms. In mice it is thought that the lymphatic components form through an angiogenic process.