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There is generally no problem in the arm clearing the widest dimension of the thoracic cage. The clavicle or collarbone forms a brace for the arms to perform this function.
the thoraric cage is part of axial skeleton which is protects and covers our internal organs of our body. Wherein, the arm is part of appendicular skeleton that is freely movable joints and it's made of long bones. Only the pectoral girdle who can contributed why the arm and thorax had a relationships.
Thoracic duct
left arm
NO
yes his arm
referred pain
Tingling in the left arm and armpit could signal a heart attack. It also could be a sign of thoracic outlet syndrome.
Harmonica
use clean and clear.
The first thoracic nerve roots are in the brachial plexus. The nerves pass through the neck, the armpit area, and then into the arm.
The forearm is distal to the upper arm. Distal meaning further away from the thoracic trunk, so technically in relation to location and height, the forearm is the lower-middle part of the arm, the hand being the absolute lowest part.