Bone marrow
Videos
Bone marrow is a semi-solid tissue found within the spongy portions of bones. In birds and mammals, bone marrow is the primary site of new blood cell production. It is composed of hematopoietic cells,
A section of bone marrow tissue (Prussian blue-stained)
Bone marrow aspirate showing normal "trilineage hematopoiesis": myelomonocytic cells (an eosinophil myelocyte marked), erythroid cells (an orthochromatic erythroblast marked), and megakaryocytic cells
Hematopoietic precursor cells: promyelocyte in the center, two metamyelocytes next to it and band cells from a bone marrow aspirate
A Wright's-stained bone marrow aspirate smear from a patient with leukemia
Neutrophil
Videos
Neutrophils are a type of phagocytic white blood cell and part of innate immunity. More specifically, they form the most abundant type of granulocytes and make up 40% to 70% of all white blood cells i
Neutrophils with segmented nuclei surrounded by erythrocytes and platelets. Intra-cellular granules are visible in the cytoplasm (Giemsa stained).
Hypersegmented neutrophil
Scanning electron micrograph of a neutrophil (yellow) phagocytosing anthrax bacilli (orange). Scale bar is 5 μm.
Micrograph showing several neutrophils during an acute inflammation