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| | ==Joint Formation== | | ==Joint Formation== |
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| | + | *Joints begin to form as the mesenchyme is condensing. |
| | + | *Joint - forming cells develop different characteristics to cartilage precursors; they are flat and densely packed. |
| | + | *The region where these joint - forming cells exist is called the "interzone". |
| | + | *There are three layers in the interzone; a middle layer of low density with regions of high density either side. |
| | + | **The high density regions form cartilage. |