The brachial plexus is an arrangement of nerve fibers, running from the spine, formed by the ventral rami of the lower cervical and upper thoracic nerve root, specifically from below the fifth cervical vertebra to above the first thoracic vertebra (C5-T1). It proceeds through the neck, the axilla (armpit region), and into the arm.
The brachial plexus is responsible for cutaneous and muscular innervation of the entire upper limb, with two exceptio...
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