Brachial Plexus. This is a network of nerves formed by the ventral rami of the lower four cervical nerves and the first thoracic nerve (C5-C8 and T1). This plexus extends from the spinal cord, through the cervicoaxillary canal in the neck over the first rib and into the armpit. It supplies afferent and efferent nerve fibers to the chest, shoulder, arm and hand.
MT's avoid this area because of nerve damage.
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