Transversus thoracis muscle

The transversus thoracis muscle is the innermost muscle of the anterior thoracic wall (deep to external intercostal and internal intercostal muscles).  

Gross anatomy

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

Blood supply
Nerve supply

The transversus thoracis muscle is an accessory muscle of respiration. It depresses the ribs which supports expiration. 

Anatomy: Thoracic


Article information

rID: 50954
Section: Anatomy
Synonyms or Alternate Spellings:

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Cases and figures

  • Figure 1: deep anterior chest wall muscles (Gray's illustration)
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  • Figure 2: intercostal space
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