![]() ![]() ![]() The lateral surface of the manubrium is broad and slightly concave, and it articulates with the first ribs at the first costal cartilage notches. The clavicular notches are located on either side of the suprasternal notch and are important for stabilizing the clavicles and for allowing movement of the shoulders. The superior aspect of the manubrium is rough and irregular, and it articulates with the right and left clavicles ( collar bones) at the clavicular notches. The suprasternal notch is an important landmark for identifying the level of the trachea. It also contains the suprasternal notch, which is a shallow depression located at the top of the bone between the clavicular notches. The anterior aspect of the manubrium is smooth and slightly convex, and it is covered by skin, fascia, and subcutaneous tissue. In human anatomy, the manubrium is the handle-like bony process, as that of the anterior segment of the sternum (or presternum) or of the malleus. The manubrium’s upper border also acts as the point where the neck’s anterior triangle begins. It makes up the anterior mediastinum’s superior wall and the superior border of the upper thoracic opening. The manubrium is the upper part of the sternum where the T3 and T4 vertebrae meet. ![]() The sternum consists of three main sternal segments, listed from the top: The sternopericardial ligamentsattach the sternum’s inner surface to the heart, and the sternocleidomastoid muscle attaches the sternum’s top to the heart. The collarbones are held up by the top of the sternum, which also connects to the costal cartilages of the first two pairs of ribs. The manubrium is one of the three bones that make up the sternum, which is a narrow, flat bone that forms the middle portion of the front of the chest. Figure 1: Parts of the sternum: manubrium (green), body (blue), xiphoid process (purple). ![]()
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