Anatomical structure, which is a subdivision of a cardinal body part; it may exclude bones; is demarcated from other subdivisions of the same cardinal body part by anatomical surfaces or lines or topographical references; together with other contiguous subdivisions of the same cardinal body part, it constitutes a cardinal body part. Examples: thorax, perineum, back of neck, forearm, hand, phalanx, nose, auricle of ear, scrotum.