Band neutrophils are the penultimate stage of granulopoiesis. In this form, the neutrophils partially enter into the peripheral blood. They constitute about of nucleated bone marrow cells (myelogram).
Band neutrophils in bone marrow cannot be distinguished morphologically from those in the peripheral blood. The indentation of the nucleus exceeds the median (compared to metamyelocytes), but a filament constriction (as seen in segmented neutrophils) does not yet exist.