inner chondrogenic layer of perichondrium
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http://purl.obolibrary.org/obo/UBERON_0008304
The perichondrium consists of two separate layers: an outer fibrous layer and inner chondrogenic layer. The chondrogenic layer remains undifferentiated and can form chondroblasts or chondrocytes. [ http://en.wikipedia.org/wiki/The_Free_Encyclopedia ]