Musculus transversus thoracis

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 2to 6costal cartilages . The transversus thoracis muscle is morphologically identical to the transversus abdominis muscle .

Blood supply
Nerve supply
Action

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

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