In the real scientific period hirudotherapy is one of the leading methods of the traditional medicine. The body of the medicinal leech produced unique natural complex of biologically active substances (BAS), which arrive independently in the human or animal body during bite. Therefore leech is the ideal instrument in a soling for a big amount of the endoecological problems. Medicinal leeches – a blood-sucking ectoparasites. They have a relative specialization: a well-developed nervous system,

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... nsory organs, muscles. The characteristics of the digestive system deep specialization are the structure of the jaws, the presence of salivary glands with a secret containing BAS, folds in the crop and others. The endosymbiotic bacterium Aeromonas hydrophila is present in gastrointestinal tract of the leech. It plays a major role in the digestion of proteins, fats and carbohydrates. It is involved in the maintenance of liquid state of the ingested blood. These adaptive mechanisms show physiological conditioning of the medicinal leeches lifestyle as free-living ectoparasites. Not all medicinal leeches overcome immunological and bacterial during feeding of the blood of native mammals, which in additional antigenic load. Some leeches can not cope with digesting food and die. The researches about the death of leeches are absent in the present scientific literature. There are no information about morphological changes in the organs of H. verbana after girudotherapeutic procedure. Purpose: The study of the morphofunctional peculiarities of internal organs and tissues in medicinal leech (H. verbana) after feeding of native human blood. Materials and methods. The experiment was carried out with mature specimens of the H. verbana in the age of 7 months, divided into 2 groups of 15 animals in each: 1) control group — hungry leeches, which were fed 3 months ago, 2) fed intact leeches after human blood feeding. Histological sections were made with anterior, middle, posterior thirds of the body. They olso were stained with hematoxyli [...]