The transverse muscle of the breast
The transverse muscle of the breast , m. Transversus thoracis, flat, thin, fan-shaped, is attached to the inner surface of the anterior thoracic wall. It starts from the inner surface of the xiphoid process and the lower part of the sternum's body. The muscle bundles, extending obliquely upward and laterally, attach to the inner surface of the III-IV ribs.
Function: participates in the act of breathing (exhalation).
Innervation: nn. Intercostales (ThII-ThVI).
Blood supply: a. Thoracica interna.
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