Thomas Bartholin was a Danish physician, mathematician, and theologian. He discovered the lymphatic system in humans and advanced the theory of refrigeration anesthesia, being the first to describe it scientifically.
Thomas Bartholin
Antiquitatum veteris puerperii synopsis, 1676
The lymphatic system, or lymphoid system, is an organ system in vertebrates that is part of the immune system, and complementary to the circulatory system. It consists of a large network of lymphatic vessels, lymph nodes, lymphoid organs, lymphatic tissue and lymph. Lymph is a clear fluid carried by the lymphatic vessels back to the heart for re-circulation. The Latin word for lymph, lympha, refers to the deity of fresh water, "Lympha".
Anatomy of the lymphatic system showing primary and secondary lymphoid organs
Reed–Sternberg cells.
"Claude Galien". Lithograph by Pierre Roche Vigneron. (Paris: Lith de Gregoire et Deneux, c. 1865)
Gabriele Falloppio