Transversus thoracis muscle

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Transversus thoracis muscle
Transversus thoracis.png
Processus xiphoideus sterni, Corpus sterni
Cartilago costalis of the (6th to) 7th rib
Cartilago costalis of Costae 2 to 6

Auxiliary muscle during expiration Spans the chest wall
Rami anteriores Nervi thoracici
(Nervi intercostales)

The transversus thoracis muscle ( Latin for "transverse chest muscle") is an inconsistent, striated muscle in humans , which tightens the wall of the chest and helps with exhalation .

The muscle has its origin on the sword process ( processus xiphoideus ) of the sternum ( sternum ) and on the cartilaginous part ( cartilago costalis ) of the (6th to) 7th rib . The insertion of the muscle is on the costal cartilage of the 2nd to 6th rib.

The transversus thoracis muscle is innervated by the anterior branches of the spinal nerves of the thoracic portion of the spinal cord. The internal thoracic artery and vein pierce the transversus thoracis muscle and then run along its outside.


  • Werner Penzner (Ed.): Dtv-Atlas of Anatomy . 4th edition. tape 1 . dtv, Munich 1984, ISBN 3-423-03017-8 , p. 82 .