Synarthrosis
Encyclopedia
A synarthrosis is a type of joint
which permits very little or no movement under normal conditions. Most synarthrosis joints are fibrous
.
Suture joints and Gomphosis joint are synarthroses.
Joint
A joint is the location at which two or more bones make contact. They are constructed to allow movement and provide mechanical support, and are classified structurally and functionally.-Classification:...
which permits very little or no movement under normal conditions. Most synarthrosis joints are fibrous
Fibrous joint
Fibrous joints are connected by dense connective tissue, consisting mainly of collagen.-Types:These joints are also called "fixed" or "immoveable" joints, because they do not move. These joints have no joint cavity and are connected via fibrous connective tissue. The skull bones are connected by...
.
Suture joints and Gomphosis joint are synarthroses.
Types
They can be categorised by how the two bones are joined together:- GomphosisGomphosisGomphosis is a joint that binds the teeth to bony sockets in the maxillary bone and mandible. The fibrous connection between a tooth and its socket is a periodontal ligament...
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 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.
- Synchondroses are cartilaginous joint connected by hyaline cartilageHyaline cartilageHyaline cartilage consists of a slimy mass, pearly bluish in colour with firm consistency and considerable collagen. It contains no nerves or blood vessels, and its structure is relatively simple....
, as seen in the epiphyseal plateEpiphyseal plateThe epiphyseal plate is a hyaline cartilage plate in the metaphysis at each end of a long bone...
. - Sutures are fibrous joints made of a thin layer of dense fibrous connective tissue that unites skull bones.