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Fig. 1. Comparison of gluteus maximus anatomy in Pan troglodytes (A,B) and
Homo sapiens (C,D). Note that the gluteus maximus in Pan has
a cranial component, the gluteus maximus proprius (GMP), and a caudal
component, the gluteus maximus ischiofemoralis (GMIF); humans have just the
GMP, but it functions primarily like the ape GMIF. The GMP in humans is much
thicker and larger than either portion of the GM in apes. The asterisk
indicates the approximate location of GM electrodes used in this study.