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brachial plexus
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brachial plexus

anatomy
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Quick Summary

The brachial plexus is a network of nerves located primarily in the armpit. It originates from spinal nerve levels C5 through T1, with contributions from C4 and T2. These nerves converge to form trunks, which then divide into divisions and cords. Ultimately, these cords branch out to supply motor, sensory, and autonomic fibers to the shoulder and the entire upper extremity, including the arm, forearm, and hand. Compression of the brachial plexus can lead to thoracic outlet syndrome (TOS), a condition characterized by pain, weakness, and altered sensation in the arm and hand.123

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3 Britannica Sources
  1. brachial plexus
  2. human nervous system - Brachial plexus
  3. thoracic outlet syndrome

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