La borsa di Fabrizio: passato e presente.

Girolamo Fabrici, or Fabrizi, also known as Fabrizio di Acquapendente, became famous as physician and anatomist. He was professor at the University of Padua, where he taught anatomy and surgery for about half a century and we owe him the construction of the Anatomical Theater. He was also a comparative anatomist, opened the field of comparative embryology and discovered the so-called “Fabrici bursa”, the site of the B lymphocytes differentiation in birds. A brief history of the researches that led to clarify the morpho-physiology of this organ is reported.