Between the 3rd and 4th parts of the sternal body, the sternal foramen can be seen. There are three horizontal ridges that pass through the 3rd, 4th, and 5th articular facets.It is where the pectoralis major is attached. The anterior surface of the sternal body is almost flat.The body of the sternum is found at the level of T5-T9 vertebrae. The corpus sterni or gladiolus is the longest part of the sternum, although it is narrower than the manubrium.The posterior surface serves as an attachment to the sternohyoid and sternothyroid muscles.The anterior surface serves as an attachment to the pectoralis major and sternocleidomastoid muscles.The inferior border has a cartilage that articulates with the sternal body at manubriosternal joint.The lateral borders have facets that articulate with the ribs.The lateral sides of the superior border of the sternum articulate with the clavicles via sternoclavicular joints.This is the depressed part that can be palpated in between the clavicles. On its center is the suprasternal or presternal or jugular notch.The superior border of the manubrium has the broadest structure among the other parts of the sternum.The manubrium sterni is the most superior part of the sternum that lies at the levels of 3rd and 4th thoracic vertebrae.
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