The study of the structures in distinct regions of the body, isolated for descriptive convenience or on a functional basis: Regional anatomy is the examination of the head, the limbs, and the abdomen, or subdivisions of these including the shoulder region, the brachial region (arm, foreleg, etc.), the gluteal region (a reference to any of the three large muscles of each buttock, especially the gluteus maximus, that extend, abduct, and rotate the thigh), etc.