An increased number of hematopoietic stem cells in mice in the initial period of the stress reaction

Morphological restructuring of lymphoid organs in birds and tailless amphibians after surgical interventions on the viscera

“…The major manifestations of stress whose degree depends on the severity of stress and scope of intervention are involution of the thymus with a characteristic sharp decrease in its cell content, drastic and almost simultaneous decrease in cell content of the bone marrow with a simultaneous increase in the total count of lymphocytes and the appearance of T cells in it, and a short-term increase in the weight and cell content of the spleen followed by hypertrophy due to cellular hyperplasia [2,4,7,8].…”

“…Increased cell content of the bone marrow is believed to be reDepartment of Zoology, Erevan University;, *Institute of Human Morphology, Rassian Academy of Sciences sponsible for subsequent stimulation of myelo-and erythropoiesis [4,7,8]. Likewise, enrichment of splenic T-zones by lymphocytes stimulates proliferation [3].…”

“…An intervention on the majority of viscera on hemopoietic tissue is a strong stress causing a complex of similar changes in the histological structure of primary and secondary lymphoid organs [2][3][4]7,8].…”