pectoral nerve

noun

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 nerve

b : one medial to the axillary artery

— called also inferior pectoral nerve, medial pectoral nerve