Bone tissue is composed of osteoprogenitor cells, osteoblasts, osteocytes in lacunae, and osteoclasts. The tissue develops a mineralized extracellular matrix. The leader line is pointing to one of the lacunae.
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The tissue in the image is bone tissue. Let us first review how is bone tissue composed. Then, we will identify its structures in the image.
Bone tissue differentiates from other tissues because of the mineralized extracellular matrix.
This tissue provides support and protection due to the rigidity and hardness of the matrix.
The bone cells are:
- Osteocytes
- Osteoprogenitores → in charge of osteoblasts production
- Osteoblasts → Synthesize and secrete osteoid matrix that will later calcify
- Osteoclasts → Phagocytic cells in charge of osseous resorption and bone modulation.
Among the matrix, there are spaces called lacunae. Each lacuna contains an osteocyte.
Osteoprogenitor cells produce osteoblast cells. When the extracellular matrix mineralizes, some of the osteoblasts get trapped in lacunae and turn into osteocytes.
Nexus union canaliculus joint trapped osteoblasts and osteocytes.
In compact tissue, the bony matrix is arranged into concentric superposed laminae, with lacunae and osteocytes can be found in between.
These laminae are arranged around a central longitudinal canal.
The whole unit -matrix, lacunae, and canal- compose the osteone.
In these images, we can see many osteones. You can identify them because
- the darkest areas are the central canals
- layers around each of these canals are the matrix arranged as concentric laminae
- Among the layer, you can see elongated dark spots that are lacunae
It seems like the leader line is pointing to one of the lacunae.
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