A 37-year-old female asked:
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would breaking the nerve across the chest lead to losing muscle mass in the upper arms? would the same be true for the nerves and muscles down front?

1 doctor answer
Dr. Simon Kimm
15 years experience Urology
Unlikely.: The nerves that supply the arms run through the brachial plexus, a network of nerves that run from the neck spinal cord through the axilla (near pit of the arm). If these were severed, loss of function and atrophy of the arm muscles would occur. No nerves that supply the arm run on the front of the chest. This area only has nerves to the skin, & nerve damage would result in numbness in the skin.
Answered on Jun 1, 2015
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Dr. Benjamin Busch
17 years experience Emergency Medicine
Could also be superficial nerves innervating pectoralis, deltoid or shoulder girdle musculature, those nerves can be superficial or coming from cervical region
Mar 1, 2013

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