Blood image

Classification

Double concave disc-shaped, thin center, thick periphery (the center of the blood smear is light red)

No nucleus, no organelles, the cytoplasm is filled with hemoglobin

Morphological variability

ABO antigen on the membrane

Improved blood cells, some of the ribosomes remain in the cell, and the tar blue staining is finely reticular

Clinical significance

Neutrophils

Barophilic granulocytes

eosinophils

Mononuclear cells

Lymphocytes

Small cytoplasmic mass that falls from megakaryocytes in bone marrow

LM

EM

Participate in coagulation and stopping blood

The earliest hematopoiesis was in the blood island at the yolk sac and other places at the third week of the embryo

In the 6th week, hematopoietic stem cells were transferred to the liver, and in the 12th week, the spleen began to participate in hematopoiesis.

Later stage of embryo and after birth, mainly hematopoiesis in red bone marrow

Red bone marrow

Yellow bone marrow

This cell originates from the yolk sac blood island, and migrates into the fetal liver, spleen and bone marrow with the blood flow. It mainly exists after birth In red bone marrow, very small amounts are present in peripheral blood

Characteristics: 1. Strong proliferation potential 2. Multi-directional differentiation ability 3. Self-renewal ability

Stem cells determined by the differentiation direction from the differentiation of hematopoietic stem cells, also known as directed stem cells

Lymph

Lymphocytes

Cylogranules are often contained in small intestinal lymph

Liver lymph contains a lot of plasma protein