How is the arm held clear of the widest dimension of the thoracic cage?

Answer

The clavicle, which is also known as the "collarbone," serves numerous functions, one of which is as a strut to dangle the arm out of the thoracic cage's width, according to Boundless. The clavicle is wider than the ribcage, so the arm is connected to its end, clearing the thorax.

The scapula, or "shoulder blade," also serves to keep the arm from colliding with the ribcage, according to Boundless. The scapula pushes against the ribcage to provide balance and leverage whenever the arm is lifted, pushed forward or pulled backward. It is the combination of three pieces (arm, clavicle and shoulder blade).

Reference:
Q&A Related to "How is the arm held clear of the widest dimension..."
"The clavicle serves as anterior brace, or strut, to hold the arm away from the top of the thorax." Human anatomy and physiology lab manual, 9th edition by elaine marieb
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The clavicle serves as anterior brace, or
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Be more specific on what you're asking, if you can't then I'm sorry but I don't understand what you want.
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the clavicle serves as anterior brace to hold the arm away from the top of thorax
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