Transverse muscle of thorax - Musculus transversus thoracis

Anatomical hierarchy

General terms > Myology > Muscles of thorax > Transverse muscle of thorax



The transverse muscle of thorax (Musculus transversus thoracis) is a triangular sheet, with transversely oriented fibers, lying on the inside of the sternum and the sternal costal cartilages. It originates from the sternal ligament and insert on the costochondral junction of the second to eight ribs.

In dogs:

Origin: By an aponeurosis on the lateral internal surface of the sternum, from the second sternebra to the caudal end of the xiphoid process.

Insertion: Second through seventh costal cartilages.

Action: Expiration. Pulls the ribs inward when contracting

Nerve: Intercostal nerves

Text by Antoine Micheau, MD - Copyright IMAIOS
Veterinary Anatomy of Domestic Mammals: Textbook and Colour Atlas, Sixth Edition - Horst Erich König, Hans-Georg Liebich - Schattauer - ISBN-13: 978-3794528332


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