Lymphatic vessels develop from lymphatic sacs, which arise from developing veins, which are derived from mesoderm.

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Quizplus · Accepted Answer

Lymphatic vessels indeed develop from lymphatic sacs, which originate from veins during embryonic development. Both veins and lymphatic vessels are derived from the mesoderm, one of the three primary germ layers in the early embryo that gives rise to the circulatory and lymphatic systems, among other structures.

Lymphatic Vessels Develop from Lymphatic Sacs, Which Arise from Developing