The color scheme still found in most modern anatomical textbooks—red for arteries, blue for veins, and yellow for nerves—originated with the research efforts of Friedrich Sigmund Merkel. His contributions to medicine spanned histology, pathology, and surgery during the late 19th century, fundamentally altering how students and practitioners visualize the internal structures of the human body.
Academic Foundation and Appointments
Born in 1845 in Nuremberg, Merkel pursued his medical education at the University of Erlangen–Nuremberg and the University of Göttingen. He earned his medical doctorate in 1869 and completed his habilitation in anatomy the following year. Throughout his career, he held professorships at three major German institutions: the University of Rostock, beginning in 1872, the University of Königsberg in 1883, and finally the University of Göttingen in 1885. At Göttingen, he worked alongside Jacob Henle, whose daughter, Anne, he later married.
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In 1875, Merkel provided the first comprehensive description of Tastzellen, specialized touch cells located in the skin of all vertebrates. Robert Bonnet later proposed the eponym Merkel cells in 1878 to recognize this discovery. Beyond his descriptive work, Merkel improved laboratory methodology by introducing xylene as a clearing agent in histology. This technique remains in use today. He also worked with assistants such as Dietrich Barfurth and Hermann Kuhnt to document anatomical structures.
Scholarly Output
Merkel authored extensive texts that shaped late 19th-century medical education. His publications include the multivolume Handbuch der topographischen Anatomie, released between 1885 and 1907, and the 11-volume Die Anatomie des Menschen. Mit Hinweisen auf die ärztliche Praxis, published from 1913 to 1918. He also produced significant studies on embryology and ocular anatomy, the latter including his 1874 work on the macroscopic anatomy of the eye, which saw a second edition in 1901 co-authored with Erich Kallius.
Fast facts
- Born: 1845, Nuremberg
- Died: 1919, Göttingen
- Citizenship: Germany
- Education: University of Erlangen–Nuremberg and University of Göttingen
- Primary Occupations: physician, university teacher, pathologist, anatomist
- Key Term: Merkel's spur (femoral calcar)
- Memberships: Royal Prussian Academy of Sciences, German Academy of Sciences Leopoldina
- Burial Site: Göttingen City Cemetery
Questions readers ask
What medical color coding did Friedrich Sigmund Merkel introduce?
He established the standard color scheme of red for arteries, blue for veins, and yellow for nerves.
What is the clinical significance of Merkel's spur?
The term is synonymous with the femoral calcar in human anatomy.
Achievements
- Held posts at University of Göttingen, University of Königsberg and University of Rostock
