Rhombus of Michaelis
Encyclopedia
Quadrilateral
In Euclidean plane geometry, a quadrilateral is a polygon with four sides and four vertices or corners. Sometimes, the term quadrangle is used, by analogy with triangle, and sometimes tetragon for consistency with pentagon , hexagon and so on...
of Michaelis) is a rhombus
Rhombus
In Euclidean geometry, a rhombus or rhomb is a convex quadrilateral whose four sides all have the same length. The rhombus is often called a diamond, after the diamonds suit in playing cards, or a lozenge, though the latter sometimes refers specifically to a rhombus with a 45° angle.Every...
-shaped contour that is sometimes visible on the lower human back. The Rhombus of Michaelis is named after Gustav Adolf Michaelis
Gustav Adolf Michaelis
Gustav Adolf Michaelis was a German obstetrician who was a native of Kiel. He studied medicine in Göttingen under surgeon Konrad Johann Martin Langenbeck and obstetrician Friedrich Benjamin Osiander , and later was director of the Obstetric Hospital and the School of Midwifery at Kiel...
, a 19th century German obstetrician.