hemopoiesis and blood - histology on the flyhistologyonthefly.com/pdfs/blood08.pdf · o...
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Hemopoiesis and
Blood
Blood
• Cellso Erythrocyteso Leukocyteso Thrombocytes
• Functiono Transport nutrients and wastes throughout the bloodstream, fight foreign
antigens and blood coagulation.
• Locationo Located in blood vessels throughout the body.
• Structureo Erythrocytes
4.2-6.2 million per cubic mm Biconcave shape Anucleated
o Leukocytes 5-10,000 per cubic mm Granulocytic
• Specific granuleso Provide function of specific white blood cell
• Azurophilic granuleso Lysosomal properties
• Neutrophilso 60%-70% of populationo Destroy bacteriao Multilobed nucleus
• Eosinophilso < 4% of populationo Phagocytose antigen-antibody complexes and kill
parasitic invaderso Bilobed nucleuso Large, red specific granules
• Basophilso < 1% of the populationo Two or more irregular lobed nucleus
Obscured by large specific granules Agranulocytic
• Lymphocyteso 20%-25% of the populationo Spherical nucleuso Few granules in cytoplasm
• Monocyteso 3%-8% of the populationo Kidney shaped nucleus, acentrico Few granules in cytoplasm
o Thrombocytes Anucleated Dislike cell fragments Hyalomere
• Peripheral clear region Granulomere
• Central darker region
• Video recordingo Blood
• Microscope imageso See above
Red Bone Marrow
• Functiono Vascular connective tissue responsible for the production of formed
elements.
• Locationo Located in the medullary cavity of long bones and within trabeculae of
spongy bone.
• Maturation Lineage of Formed Elementso Erythropoiesis
Myeloid Stem Cell Proerythroblast
• Large cell• “Lacy” chromatin• Nucleoli• Basophilic cytoplasm
o Due to synthesis of hemoglobin Basophilic erythroblast
• More basophilic• Condensed nucleus
Polychromatophilic erythroblast• Regions of basophilia and acidophilia
Orthochromatophilic erythroblast• Uniform acidophilic cytoplasm
Reticulocyte• Ejection of nucleus• 1% of circulating blood cells
Erythrocyte• Matured reticulocytes• See previous study guide topic
o Leukopoiesis Granulocytes
• Myeloblasto Finely dispersed chromatino Faint nucleoli
• Promyelocyteo Basophilic cytoplasmo Azurophilic granules
• Myelocyteo Differentiation startso Increase in granules
• Metamyeloctye
o Further differentiation o Condensation of nucleus
• Stab/Band cell o Elongated nucleus
• Neutrophil, eosinophil, basophil, monocyte o See next study guide topic
Lymphoid Stem Cell • Lymphoblast • Prolymphocyte • Lymphocyte
o See previous study guide topic
o Thrombopoiesis
Myeloid Stem Cell Megakaryoblast
• Large, rare • Basophilic cytoplasm
Megakaryocyte • Larger • Cytoplasm is less basophilic • Diassociate into thrombocytes
Thromobocytes • See previous study guide topic
• Structure of Bone Marrow
o Endosteum o Sinusoids
Lined with endothelial cells o Islands of hemopoietic cells
Blood cells in various stages of maturation o Macrophages
Acute Granulocytic Leukemia (Acute Myeloblastic Leukemia)
• Etiology o Cancer of the bone marrow or blood o Most adult cancer o Abnormal rapid growth of immature (acute) white blood cells
Myeloid stem cell
• Pathological Features o Increased amount (~10x) immature white blood cells in a peripheral smear
Immature white bloods cells should not be found in the blood Mostly promyelocytes
• Hypergranular • Multiple nucleoli • Fine nuclear chromatin • Scant to moderate amount of cytoplasm
o Auer rods Red-staining rod like structures Clumps of azurophilic granules
o Decreased amounts of other cells (i.e. thrombocytes) Bone marrow is occupied with making myelocytic cells
• Microscopic images
o 40x
Chronic Lymphocytic Leukemia
• Etiology o Cancer of the bone marrow or blood o Abnormal rapid growth of mature lymphocytes
Most common are B-Lymphocytes
• Pathological features o Increased amounts (~10x) of mature lymphocytic cells o Irregular nuclei with clumped chromatin o Smudge cells
Crushed nuclei of lymphocytes due to fragility during preparation o Rieder cells
Lymphocytic cells with nuclear clefts, indentations, and deep grooves
• Microscopic images o 10x o 40x
Sickle Cell Anemia
• Etiology o Autosomal recessive disorder o Abnormal hemoglobin molecules within the beta chain
Substitution of glutamic acid with valine Causes a structural disorder within the red blood cell
• Loss of flexibility • Dysfunction at capillary beds
• Pathological features
o Increased destruction of sickled red blood cells Anemia
o Anisocytosis Unequal sizes of blood cells
o Poikilocytosis Abnormally shaped blood cells
• Microscopic images
o 40x
erythrocytes
neutrophil
eosinophil
basophil
lymphocytes
monocyte
thrombocytes
proerythroblast
orthochromatrophic erythroblast
promyelocyte
myelocyte
stab band cell
megakaryocyte
40x acute granulocytic leukemia
10x chronic lymphocytic leukemia
40x chronic lymphocytic leukemia
40x sickle cell anemia