brachial plexus

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A network of nerves located in the neck and axilla, composed of the anterior branches of the lower four cervical and first two thoracic spinal nerves and supplying the chest, shoulder, and arm.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a network of nerves formed by cervical and thoracic spinal nerves and supplying the arm and parts of the shoulder