Sentinel lymph node is defined as
The first axillary lymphnode draining the breast (by direct drainage) is designated as sentinel lymph node. SLN is first node involved by tumour cells and presence or absence of its histological involvement when assesed will give a predictive idea about fuher spread of tunour to other nodes. SRB's Manual of Surgery.Edition -5. Pg no:543
Primary LN draining tumor
LN which is first excised during MRM
LN nearest to tumor
None
Endocrinology and breast