
Jennifer M. answered 05/28/22
Tutor Specializing in Organic and General Chemistry
The brachial plexus is a web of somatosensory and motor nerves formed mainly by the anterior rami of nerves C5 to T1 (C4 and T2 contribute slightly). It passes over the first rib into the axilla and innervates the upper limb and some of the neck and shoulder muscles.