Organ Hematopoietic

Organ of hematopoietic cells - in Greek also: bone marrow, hematoiostis, gehemoion: hemato- blood + iosis, that which relates to blood; hemantia: -s, Greek: Blood; heyhamathia: ghahamathiahematological remedy (medicine). Nowadays, this organ is known under the scientific name hematopoietic organs. In humans, these are the red bone and liver, in vertebrates and birds - the medial-ventral outgrowth of the brain. It contains hematopoietic stem substance, or stem cell substance, which is the main part of its tissue. Its history and function is to produce and maintain a blood line consisting of four types of white blood cells (lymphocytes, granulocytes).

Bone marrow consists of three parts:

Erythroblastic, which surrounds an immature erythroid cell. It produces red blood cells. Macrophages are the simplest cells of the bone marrow of macrophages, carrying lysis, and which absorb foreign bodies, erythrograms, red blood cell corpses and phagocytose soft cell fragments; macrophages contain so-called phage cells, which receive all the encrustations of the erythrogram and the substances associated with them, while the rest of what is absorbed is in their membrane. Erythropoiesis occurs first inside the vascular space, and then in cells located slightly below the capsule.

Monocytic, located between erythroblasts and macrophages. Here there are multinucleated cells of a plastic nature. Thanks to them, hematopoietic monosomes are activated, initiate and control erythropoiesis

Hematopoietic tissue, or hematopoietic tissue, is one of the components of the blood system. It is called an organ and is located inside the body - in the bone marrow, liver, spleen and a number of other organs. This organ is represented by phagocytic cells, erythropoiesis, leukopoiesis and thrombocytopoiesis. And the cells of hematopoietic tissue have enormous regeneration potential and the ability to restore its function is possible even after quite serious damage or injury. However, these features are also vulnerabilities of the hematopoietic organ, which increases its sensitivity to radiation and chemotherapy.

An organ of hematopoietic origin is the part of the body responsible for the production and regulation of hematopoietic cells. The main purpose of the organ of hematopoietic origin is the formation of red blood cells, leukocytes and platelets.

The hematopoietic organs are an organ system consisting of various structures found in the bone marrow, liver, and spleen. Morphologically, the following components of this system are distinguished:

- bone marrow, red bone marrow and yellow bone marrow (due to the presence of adipose tissue);

- liver;

- spleen.

In addition, we can distinguish groups of hematopoietic cells involved in hematopoiesis: 1. Static: stem and semi-stem cells of hematopoiesis. 2. Replaceable or metabolic: precursors of erythrocytes (erythroid cells), precursors of immunopoietic elements (mononuclear cells, lymphocytes). 3. Regulators of hematopoiesis: erythropoietin (EPO), iron, insulin.

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