Transversus thoracis

A thin muscle located in the chest wall that plays a role in respiration.

Transversus thoracis is a thin, flat muscle that anchors itself to the inner surface of the sternum and the costal cartilages of the second to sixth ribs. It is situated in the anterior thoracic wall and contributes to the overall structure of the thoracic cavity. Functionally, it participates in various movements associated with breathing, particularly expiration.

Terminologia Anatomica

musculus transversus thoracis

System

Muscular system

Function

The primary function of the transversus thoracis is to assist in the mechanics of breathing. By contracting, this muscle can help lower the ribs during expiration, supporting the expulsion of air from the lungs. Additionally, it plays a role in maintaining the position of the thoracic wall, which is crucial for the stability of the rib cage during respiration. By providing tension to the rib cage, transversus thoracis contributes to the rhythmic expansion and contraction vital for effective breathing. Furthermore, its involvement in postural support highlights its importance in overall thoracic stability, thus influencing respiratory efficiency.

Location

Transversus thoracis is located on the inner surface of the thoracic wall, directly behind the sternum. It extends from the xiphoid process and the lower part of the sternum, with fibers radiating outwardly to the cartilages of the second through sixth ribs. This positioning allows it to interconnect and interact with both rib and sternum movements, making it integral to the complex mechanics of the thoracic cavity. Its anatomy is well-placed to influence not only the ribs above but also the movement between the sternum and the ribs, showcasing its synergistic role in ventilation.

Did You Know?

Despite its small size, the transversus thoracis is essential for effective breathing, particularly in actions that require forceful exhalation.
This muscle is often overlooked in anatomical studies, yet it plays a crucial role in maintaining the integrity of the thoracic cavity.
In individuals with respiratory difficulties, the role of the transversus thoracis becomes increasingly significant, as it assists in stabilizing the thoracic area.