pectoral nerve

noun

: 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