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The transverse muscle of the breast
Last reviewed: 19.11.2021
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The transverse muscle of the breast (m. Transversus thoracis) is located on the posterior (inner) surface of the anterior thoracic wall. This muscle begins on the xiphoid process, the lower half of the sternum. Bunches of muscle, diverging in a fan-like manner laterally and upward, are attached to the cartilages of the II-VI ribs by separate teeth. The lower fascicles of the muscle pass horizontally, closely adjoining the upper fascicles of the transverse abdominal muscle. Middle beams are oriented obliquely from the bottom upward and laterally, and the upper ones run almost vertically from the bottom upwards.
The function of the transverse muscle of the breast: having a support on the sternum, this muscle pulls the costal cartilage down, lowers the ribs, participates in the exhalation act.
Innervation of the transverse muscle of the chest: intercostal nerves (ThII-ThVI).
Blood supply to the transverse breast muscle: internal thoracic artery.