Transversus thoracis muscle
The transversus thoracis is a thin band of muscle and tendon arising from the lower posterior surface of the sternum, posterior edge of the xiphisternum and the costal cartilage of the lowest 3 - 4 ribs at their sternal end. It diverges supero-laterally to attach by slips to the underside of the 2nd to 6th costal cartilages 1. The transversus thoracis muscle is morphologically identical to the transversus abdominis muscle 2.
- intercostal arteries
The transverse thoracis muscle is an accessory muscle for respiration. It pulls the ribs crainally which supports expiration.
- 1. Gray Henry, T. Pickering Pick and Robert Howden. Anatomy, descriptive and surgical. 39th ed. New York: Bounty Books, 1977
- 2. Sinnatamby, C. and Last, R. Last's anatomy. 12th ed. Edinburgh: Churchill Livingstone/Elsevier, 2011
- 3. West J. Respiratory physiology - the essentials. 9th ed. Philadelphia: Wolters Klower/Lippincott Williams and Wilkins, 2011