What is the manubrium part of?

The manubrium is the uppermost part of the sternum, also known as the breastbone. This flat bone is centrally located in the chest and serves as an important attachment point for several anatomical structures, such as the clavicles (collarbones) and the first two pairs of ribs. Its structure allows it to provide support and stability for the rib cage, contributing to the protection of the heart and lungs. Understanding its role in the thoracic anatomy highlights its significance in the overall structure of the human body, particularly in the context of respiratory function and overall posture.