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They can be categorised by how the two bones are joined together:
- Synchondroses are joints where the two bones are connected by a piece of cartilage.
- Synostoses are where two bones that are initially separted eventually fuse together, essentially becoming one bone. In humans the plates of the cranium fuse together as a child approaches adulthood. Children whose craniums fuse too early may suffer deformities and brain damage as the skull does not expand properly to accommodate the growing brain, a condition known as craniostenosis.
- "Module - Introduction to Joints". Retrieved 2008-01-29.