General

There is usually only one forelimb lymph node, the axillary lymph node (Ln. axillaris). Occasionally, a second lymph node can be found, usually located on the lateral thoracic wall in the 3^rd intercostal space, which, based on its drainage region, is simply an extension of the axillary lymph node (see axillary lymph node); therefore I have named this lymph node the accessory axillary lymph node (Ln. axillaris accessorius).