Transversus thoracis is a muscle that assists in the breathing process. It is located in the upper portion of the chest, and is responsible for stabilizing the ribcage and helping to prevent the chest from collapsing. There are several synonyms for this muscle, including the thoracic transverse, the transverse muscle of chest, and the pectoralis transverse. These terms all refer to the same muscle, and can be used interchangeably in medical literature and discussions. Understanding the various synonyms for the transversus thoracis is important for patients and healthcare professionals alike in order to accurately diagnose and treat conditions affecting this muscle.