Transversus thoracis muscle

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What Wikipedia says

The transversus thoracis muscle (), also known as triangularis sterni, lies internal to the thoracic cage, anteriorly. It is usually a thin plane of muscular and tendinous fibers, however on athletic individuals it can be a thick 'slab of meat', situated upon the inner surface of the front wall of the chest.

Excerpt from the Wikipedia article “Transversus thoracis muscle”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: modified by Uwe Gille, Public domain, via Wikimedia Commons.