Rhombus of Michaelis

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Rhombus of Michaelis, also called Michaelis-Raute or the quadrilateral of Michaelis, is a diamond-shaped pattern that some people can see on the lower back. It is defined by four points: the two dimples of Venus, the top of the gluteal crease near the S5 vertebra, and the bottom end of the crease near the L5 vertebra. The name honors Gustav Adolf Michaelis, a German obstetrician from the 19th century.