[On the vestiges of Heinrich Frenkel (1860-1931)--Pioneer of neurorehabilitation. Annotation to the cover picture].

Heinrich Simon Frenkel or Frenkel-Heiden(1860-1931) is almost completely forgotten as a founder of neurorehabilitation and little is known about his life. Frenkel's main contribution, "The treatment of tabetic ataxia by meansof systematic exercise: An exposition of the principles and practice of compensatory movement treatment", was reprinted several times in English (1902, 1905, 1917). Frenkel exerted great influence among his contemporaries, including his direct student Otfrid Foerster (1873-1941) who became one of the most important neurologists and neurosurgeons of the 20th century. A floor mosaic, preserved in the historic building of the "Medizinische Poliklinik" in Munich, is an exact copy of the pattern of traces that Frenkel had published in 1900 for proprioceptive gait exercises in tabes dorsalis.