transversus thoracis (muscle)
trans·ver·sus tho·ra·cis (mus·cle)[TA]
internal muscle of thorax; origin, dorsal surface of xiphoid process and lower portion of dorsal surface of body of sternum; insertion, second to sixth costal cartilages; action, contributes to depression of ribs, narrowing chest; nerve supply, intercostal.
Synonym(s): musculus transversus thoracis [TA], musculus triangularis sterni, sternocostalis muscle, transverse muscle of thorax
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