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Figure 1 | Journal of Cardiothoracic Surgery

Figure 1

From: Sternalis muscle: an underestimated anterior chest wall anatomical variant

Figure 1

Bilateral strap-like sternalis muscle (SM) in a female cadaver. The muscle arises from the tendon of the sternal origin of the sternocleidomastoid muscle (St) and the upper segment of the pectoralis major on each corresponding hemithorax. On the right side, it runs in convex course and terminates at the right sternocostal arch and onto the right external oblique muscle aponeurosis. While on the left, the muscle split into two bellies (arrows) and is inserted onto the left 10th-12th costal cartilages and costochondral junctions and terminates on the left sternocostal arch. PM: pectoralis major.

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