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They can be categorised by how the two bones are joined together:
- Gomphoses are found in the sockets of the teeth. The socket of a tooth is often referred to as a gomphosis (type of a joint in which a conical peg fits into a socket). Normally, there should be an absolutely minimal amount of movement of the teeth in the mandible or maxilla.
- Synostoses are where two bones that are initially separated eventually fuse together, essentially becoming one bone. In humans the plates of the cranium fuse together as a child approaches adulthood. Children whose cranial plates 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.
- Synchondroses are cartilaginous joint connected by hyaline cartilage, as seen in the epiphyseal plate.
- Sutures are fibrous joints made of a thin layer of dense fibrous connective tissue that unites skull bones.
- "Module - Introduction to Joints". Retrieved 2008-01-29.
- Principles of Anatomy & Physiology, 12th Edition, Tortora & Derrickson, Pub: Wiley & Sons
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