CBIO2500 Notes- Articulations,Joints

CBIO2500 Notes- Articulations,Joints - Articulations...

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Articulations Articulations are points of contact between bone and bone, bone and cartilage, or bone and teeth, that allow for movement.
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Classification of Joints Structural is based upon how bones are joined. bony (synostosis) fibrous (synarthrosis) cartilaginous (amphiarthrosis) synovial (diarthrosis) Functional is based upon range of movement. synostosis synarthrosis amphiarthrosis diarthrosis essentially immobile syn = together arthrosis = joint dia = through
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Structure determines function and strength. High congruity = little movement, but resistant to dislocation. Low congruity = high mobility, but little resistance to dislocation. Movement is ultimately determined by three factors: The way the articulating surfaces fit together. The flexibility of the tissues that bind the bones together. The position of the ligaments, tendons and muscles.
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Structural Classification of Joints
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Synostosis (Bony Joint) immovable joint usually from the fusion of bones in childhood - ossification Can you think of an example from bone development?
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Fibrous joints are all connected by dense regular CT
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Synarthroses (Fibrous Joints) Suture synarthrotic may ossify: synostosis protection
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Gomphosis attachment of a tooth to its socket held in place by a periodontal ligament Synarthroses (Fibrous Joints)
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Syndesmosis most mobile of all fibrous joints interosseous ligaments Synarthroses (Fibrous Joints)
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Cartilaginous joints are all held in place by cartilage.
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