What is the upper portion of the sternum known as?

The upper portion of the sternum is known as the manubrium. This triangular bone is the most superior part of the sternum, serving as an important landmark in anatomy and having connections to several rib pairs and the clavicle. The manubrium articulates with the first and second ribs, as well as with the body of the sternum, allowing for the attachment of various structures and helping to protect the thoracic cavity. This portion of the sternum plays a crucial role in respiration and providing structural stability to the anterior wall of the chest. The terminology for the other components of the sternum aids in distinguishing the specific parts and their functions, but they do not represent the upper portion specifically like the manubrium does.