The heel is the rear part of the foot. It is part of the bone structure.
In the measurements of the human body, most times it is identified with the ground.
In measurements, the heel always refers to the ground plane, except in the instep-heel contour. In that case, the heel refers to the calcaneus.
Anatomy of the human body by Gray, Henry, 1825-1861; Lewis, Warren Harmon, 1870_p276
Anatomy of the human body by Gray, Henry, 1825-1861; Lewis, Warren Harmon, 1870_p1338
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