Ernst Gräfenberg Ernst Gräfenberg Ernst Gräfenberg (September 26, 1881 in Adelebsen near Göttingen, Germany – 28 October 1957 in New York City, United States) was a German-born physician (medical doctor) and scientist. He is known for developing the intrauterine device (IUD), and for his studies of the role of the woman's urethra in orgasm. The G-spot is named after him. Gräfenberg studied medicine in Göttingen and Munich, earning his doctorate on 10 March 1905. He began working as a doctor of ophthalmology at the university of Würzburg, but then moved to the Department of Obstetrics and Gynaecology at the University of Kiel,
Friedrich Ernst Krukenberg of the ovary that was to become known as a Krukenberg tumor. In 1896 he published his findings in an article called " Über das Fibrosarcoma ovarii mucocellulare (carcinomatodes)". Later, his interest turned to ophthalmology, and eventually he returned to Halle where he opened a private practice. The ophthalmic term "Krukenberg's spindle" is named after him, which is a vertical, fusiform deposition of melanin pigmentation in the deep layers of the cornea. Friedrich Ernst Krukenberg Friedrich Ernst Krukenberg (1 April 1871 – 20 February 1946) was a German physician who was a native of Halle an der Saale. He was