ANAT 1507 Detailed Notes for Joints & Spinal Column Joints

ANAT 1507 Detailed Notes for Joints & Spinal Column Joints

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I. Joints— a union or junction between two or more bones or rigid parts of the skeleton a. Structural Classification i. Fibrous Joints— no joint cavity, bones are held together by connective tissue rich in collagen fibers ii. Cartilagenous Joints— no joint cavity, bones are held together by cartilage iii. Synovial Joints— have a joint cavity, surrounded by articular capsule, and frequently have an accessory ligament 1. intracellular ligament— (ACL) cruciate ligament 2. extracellular ligament— tibial and fibular collateral ligaments b. Functional Classification i. Synarthrosis— complete immobility ii. Ampphiarthrosis— slight mobility iii. Diarthrosis— complete maneuverability c. Fibrous Joints i. 3 types suture, syndesmosis, gomphosis ii. Suture 1. held together by thin layers of dense fibrous connective tissue 2. some are present in child then replaced by bone in adult hood (process of syntosis) iii. Syndesmosis 1. held together by thin layers of dense fibrous connective tissue but more than a suture 2. not as tightly united as sutures 3. slightly moveable (tibia to fibula; radius to ulna) iv. Gomphosis 1. coneshaped peg fits into a socket (teeth into aleveoli) d. Cartilaginous Joints i. 2 types: synchondrosis and symphsis ii. Synchondrosis 1. hyaline cartilage (most common cartilage) used as connective tissue 2. function as synarthrosis iii. symphisis (seconday cartilaginous joints) 1. broad flat disc of fibrocartilagenous material
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ANAT 1507 Detailed Notes for Joints & Spinal Column Joints

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