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Chap 8 CBIO - • Bind bones tightly together but allow for...

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Joints (Articulations) Weakest parts of the skeleton Articulation – site where two or more bones meet (may be movable, immovable or semimovable) Functions of joints Give the skeleton mobility Hold the skeleton together Classification of Joints 1. Based on the type of tissue found at the joint and whether or not a joint cavity is present (structural classification) The three structural classifications are: 1. Fibrous 2. Cartilaginous 3. Synovial 2. The amount of movement allowed (functional classification) The three functional classes of joints are: 1. Synarthroses – immovable 2. Amphiarthroses – slightly movable 3. Diarthroses – freely movable Fibrous Structural Joints The bones are joined by fibrous tissues There is no joint cavity Most are immovable There are three types – sutures, syndesmoses, and gomphoses Fibrous Structural Joints: Sutures Occur between the bones of the skull Comprised of interlocking junctions completely filled with connective tissue fibers
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Unformatted text preview: • Bind bones tightly together, but allow for growth during youth • In middle age, skull bones fuse and are called synostoses Fibrous Structural Joints: Syndesmoses and Gomphoses Syndesmoses :- Bones are connected by a fibrous tissue ligament Movement varies from immovable to slightly variable e.g. the connection between the tibia and fibula, and the radius and ulna Gomphoses :-The peg-in-socket fibrous joint between a tooth and its alveolar socket. The fibrous connection is the periodontal ligament Cartilaginous Joints • Articulating bones are united by cartilage • They tend to be slightly movable, so they are classified as amphiarthrosis joints using the functional classification system, although some are completely immovable (synarthroses). • Lack a joint cavity • Two types – synchondroses and symphyses...
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