part of part of Homo sapiens sternum zone of bone organ sternal region bone 2026-03-19T00:00:00Z A zone of bone organ encompassing the full extent of the sternum as the flat, elongated bone forming the midline of the anterior thoracic wall, comprising the manubrium, body, and xiphoid process, and providing articular surfaces for the clavicles and costal cartilages of ribs 1–7 as well as attachment for thoracic and abdominal muscles. David Osumi-Sutherland