Medical Definition of pectoral nerve
: either of two nerves that arise from the brachial plexus on each side or from the nerve trunks forming it and that supply the pectoral muscles:a: one lateral to the axillary artery—called also lateral pectoral nerve, superior pectoral nerveb: one medial to the axillary artery—called also inferior pectoral nerve, medial pectoral nerve
Seen and Heard
What made you want to look up pectoral nerve? Please tell us where you read or heard it (including the quote, if possible).