The lateral cord of the brachial plexus is lateral to the axillary artery and is formed from the anterior divisions of the superior and middle trunks; thus, it contains portions of nerves [tex]C_{5} -C_{7}[/tex].
The three anterior and three posterior divisions of the brachial plexus combine to generate the cords in the following manner: The anterior division of the superior trunk and the anterior division of the middle trunk combine to generate the lateral cord.
The lateral pectoral nerve, which originates from the lateral cord and contains the spinal levels [tex]C_{5} -C_{7}[/tex] and innervates the pectoralis major muscle, is the only nonterminal branch. The medial pectoral, medial brachial cutaneous, and medial antebrachial cutaneous nerves are the three non-terminal branches that emerge from the medial cord.
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