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Thoracic outlet is the diagnosis given to pain, numbness and weakness of the arm/hand that is caused by compression of nerves and or blood vessels, which travel from the chest to the arm. Different target tissue may be causing the compression:
Pectoralis muscle may be tight, compressing the neurovascular bundle as it stretches across the chest to the shoulder.
The collarbone may be dropped down either from asymmetrical posture or carrying heavy bags. Women may experience compression from the weight of large breasts on both collarbones.
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An extra rib on the 7th cervical vertebra may be pressing on nerves or blood vessels as they exit the spine.
The scalene muscles which lift the first two ribs may be tight, hence cause the neurovascular bundle to be pinched between the collarbone and ribs or the scalenes themselves can pinch nerves that run through them.
Over-retraction of one's shoulders (military posture) can create compression of the neurovascular bundle between the collarbone and ribs. Add the downward compression of a backpack and you've increased the risk.
See Tho 1 and link
www.nlm.nih.gov
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