In a healthy adult man, the commonest and smallest type of leucocytes are
Basophils
monocytes
eosinophils
lymphocytes
categories of WBCs -
granulocytes and agranulocytes
-
Lymphocytes are the smallest (6-10 nm) and the most common (20-25% of total leucocytes) leucocytes after neutrophils (60-65% of total leucocytes).