"Sappey plexus takes its name from Marie Philibert Constant Sappey (1810-1896) 7, a French anatomist who published his comprehensive atlas in 1874, including an anatomic study of cutaneous lymphatic drainage. Sappey's results demonstrated lymphatic drainage based on anatomic location."
"Sappey plexus is a network of lymphatics in the areola of the nipple. Sappey plexus assumes considerable importance in the identification of the sentinel lymph node since the subareolar route is the most straightforward to infiltrate with an injected radiotracer/dye and the most suitable in special cases, such as non-palpable tumours, multicentric or already excised tumours."