Vasa efferentia are small tubular structures found in the male reproductive system. These structures are responsible for transporting sperm from the testicles to the epididymis. There are a few different synonyms for the term "vasa efferentia," including the efferent ducts, excretory ducts, and ductuli efferentes. The term "excretory ducts" is commonly used in anatomy textbooks to describe the function of these structures, as they play a crucial role in carrying sperm out of the testicles and into the epididymis where they can be stored and matured. Regardless of the synonym used, the vasa efferentia are a vital component of the male reproductive system.