![]() The superior sternopericardial ligament connects the heart’s covering, the pericardium, to the manubrium. The second pair of costal cartilage attaches to the sternum at the lower border of the manubrium. However, its posterior surface gives attachment to sternohyoid and sternothyroid muscles. The sternal fibers of sternocleidomastoid and pectoralis major muscle get attached to the anterior surface of the manubrium. It articulates with the body of the sternum, forming the sternal angle or Angle of Louis with a thin layer of cartilage in between. The inferior portion or lower border of the manubrium is narrow and rough. It also features a demifacet or half-facet for articulation with a part of the costal cartilage of the 2 nd rib. The lateral edges or lateral borders of the manubrium bear facets for articulation with the costal cartilage of the 1 st rib. These fossae articulate with the medial ends of the collar bones, forming the sternoclavicular joints. On either side of the jugular notch, two other large fossae, known as clavicular notches, are present, projected upward and laterally. The top part or superior border of the manubrium is concave, producing a depression called the jugular notch or suprasternal notch. It is large and quadrangular or trapezoid in shape, bearing several important bony landmarks.
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