The manubrium is a part of the sternum. There are three parts to the sternum: the manubrium (up top), the body (in the middle), and the xiphoid process (the tip, at the bottom).
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The manubrium is a bone that forms the upper part of the sternum. Its main purpose is to provide attachment points for the clavicles and ribs, helping to support the structure of the chest and facilitating movements of the upper body.
The manubrium
The union of the manubrium and the body of the sternum is called the sternal angle or angle of Louis. It marks the level of the second rib and the cartilaginous joint between the manubrium and body of the sternum. It is an important landmark in anatomy for locating structures in the chest.
The sternoclavicular joint is formed by the articulation between the clavicle (collarbone) and the manubrium of the sternum (breastbone), along with the first costal cartilage.
The cranial portion of the sternum is called the manubrium. It is the top portion of the sternum that articulates with the clavicles and the first rib.
Your thoracic cavity starts from the upper margin of the thoracic vertebra to upper margin of the manubrium of the sternum. There is your diaphragm on the lower side.