[Ultrastructural organization of the hematopoietic microenvironment of human bone marrow].

The results have been presented of electron-microscopic and ultracytochemical investigations of sinusoidal vessels, fat, reticular and endosteal cells of the bone marrow from the iliac bone fragments of 30 normal subjects. Close morphological and functional relationships have been established between the structures of the hemopoietic microenvironment and hemopoietic cells, and the role of certain stromal elements in the maintenance of the hemopoietic function has been specified.