DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY
Photocomposite - Hematopoietic human stem cells (adult) in the bone marrow cavity (mammal), scanning electron micrograph (SEM). For illustrative purposes the human borrow marrow cells have been enlarged and placed in a mammal's bone marrow cavity. Stem cells are part of the hematopoietic and reticuloendothelial systems and give rise to specialized blood cells. The bone marrow consists of packed hematopoietic cells, reticular cells and adipose cells. They occupy all the extravascular spaces around an extensive system of channels called venous sinuses. Blood cells develop outside of the extravascular system and must pass through the walls of the sinuses to enter the circulation system. The common stem cells developing in bone marrow differentiate along various lines to form red and white blood cells. Magnification: x70 (marrow cavity); x290 (stem cells) when shortest axis printed at 25 millimetres.
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