Definitions for brachial plexus
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brachial plexus, plexus brachialis(noun)
a network of nerves formed by cervical and thoracic spinal nerves and supplying the arm and parts of the shoulder
The brachial plexus is a network of nerve fibers, running from the spine, formed by the ventral rami of the lower four cervical and first thoracic nerve roots. It proceeds through the neck, the axilla, and into the arm. It is a network of nerves passing through the cervico-axillary canal to reach axilla and supplies brachium, antebrachium and hand.
U.S. National Library of Medicine
The large network of nerve fibers which distributes the innervation of the upper extremity. The brachial plexus extends from the neck into the axilla. In humans, the nerves of the plexus usually originate from the lower cervical and the first thoracic spinal cord segments (C5-C8 and T1), but variations are not uncommon.
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"brachial plexus." Definitions.net. STANDS4 LLC, 2015. Web. 2 Dec. 2015. <http://www.definitions.net/definition/brachial plexus>.