“…Langhans (1875) added his description of the decidua basalis and said that the separation occurred in the spongy layer, whilst many others believed the muscle to be denuded at parturition. Kroenig (1901) returned to the earlier opinions and asserted that the thickness of decidua retained varied from a few cells to several millimetres. Wormser (1903) made a comprehensive review of the literature and added descriptions of a further 7 whole uteri from the puerperal period.…”