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Hyaline Cartilage. The image on the left is a higher magnification of a portion of the previous slide. Note the smaller, more oval lacunae containing chondroblasts at the periphery of this cartilage section(black arrow). The chondrogenic layer contains chondroblasts that have not yet secreted matrix (red arrow). Outside of the chrondrogenic layer is the fibrous layer (green arrow) containing collagen fibers, fibroblasts, and mesenchymal cells.

The image on the right is an enlargement of a portion of the image on the left. Several lacunae containing chondroblasts are present (green arrow). Several cell nests are present some of which are begining to separate due to the secretion of new matrix. The matrix of hyaline cartilage (yellow arrow) appears very homogenous even though it contains about 40% collagen fibers. (what type collagen??) The fibers and the ground substance have the same index of refraction so that the matrix appears to be "non-fibrous". This is in contrast to elastic cartilage which has a very fibrous matrix.