The axillary lymph nodes receive drainage from the upper limb, upper back and shoulder, lower neck, chest, upper anterolateral abdominal wall, and 75% of the mammary gland. There are typically 20-30 axillary lymph nodes divided into 5 groups: humeral (lateral) nodes which receive lymph from the upper limb; pectoral (anterior) nodes which receive lymph from the upper anterior trunk and major part of the breasts; subscapular (posterior) nodes which receive lymph from the posterior trunk and axillary tail of the breast; central nodes which receive lymph from the anterior, posterior, and lateral groups; and apical nodes which receive lymph from the central group, upper part of the breast,