Oscar Wilhelm August (Oscar) Hertwig (1849–1922)

German anatomist and zoologist. Studied medicine at Jena, Zurich, and Bonn. MD 1872. Habilitated in anatomy in the medical faculty, Jena, 1875; professor extraordinarius of anatomy, 1878; professor, 1881. Director, Anatomical Institute, Berlin, 1888–1921. Worked on the embryology of tunicates and sea urchins; observed fertilisation of sea-urchin eggs and explained the process.