Page 278 - Atlas of Histology with Functional Correlations
P. 278
Lining the bony trabeculae (5) in the marrow cavities (4) is a thin inner layer of
cells called endosteum (10). Cells in the periosteum (2, 7) and in the endosteum
(10) give rise to bone-forming osteoblasts.
FIGURE 7.26 ■ Cancellous bone with trabeculae and bone marrow cavities:
sternum (decalcified bone, transverse section). Stain: hematoxylin and eosin.
Low magnification.
FIGURE 7.27 | Cancellous Bone: Sternum
(Transverse Section, Decalcified)
This photomicrograph shows a section of cancellous bone from the sternum.
Cancellous bone is composed of numerous bony trabeculae (1) separated by the
marrow cavity (5) with blood vessels (7) and different blood cells (8). Bony
trabeculae (1) are lined by a thin inner layer of cells of the endosteum (4, 6).
Osteoprogenitor cells in the endosteum (4, 6) give rise to osteoblasts. Formed
bone matrix contains numerous osteocytes in lacunae (2). The large,
multinuclear osteoclasts (3) are eroding or remodeling the formed bone matrix.
Osteoclasts (3) erode part of the bone through enzymatic action and lie in
Howship lacunae.
277
