Transversus thoracis muscle

The transversus thoracis muscle is the most anterior muscle of the inner layer (external intercostal, internal intercostal and transversus thoracis) of the thoracic wall.  

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
Action

The transverse thoracis muscle is an accessory muscle for respiration.  It pulls the ribs crainally which supports expiration. 

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Article information

rID: 50954
Synonyms or Alternate Spellings:

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Cases and figures

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    Figure 1: intercostal space
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