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19 Cards in this Set
- Front
- Back
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Types of Joints
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synarthrosis = immoveable
amphiarthrosis = slightly moveable synovial / diarthrosis = freely moveable |
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synarthrosis
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Immovable type of joint
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amphiarthrosis
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slightly moveable
Three types Fibrous Joint Syndemosis Joints Cartilaginous Joints |
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Fibrous Joints
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amphiarthrosis Joint
Slightly moveable 2 bones are joined together by fibrous CT Ex: PDL is a gomphosis joint that connects teeth to alveolar bone |
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Syndemosis Joints
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amphiarthrosis joint
Slightly moveable 2 bones are joined together by ligaments Ex: tibia, fibia, radius, ulna |
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Cartilaginous Joints
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amphiarthrosis joint
slightly moveable 2 bones joined together by cartilage Ex: true ribs and pubic symphysis |
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Synovial Joint
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Free moveable
2 bones joined together with articulating cartilage disk in between CT capsule surrounds |
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What does TMJ articulate
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Temporal bone and Mandibular bone
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Articular disk
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Divides the joint cavity into an upper and lower compartment
Firmly attached anteriorly Loosely attached posteriorly Lack of vascularity = inability to repair itself Thick bundles of collagen and reticular fibers |
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Upper compartment of disk performs what movement
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Gliding or translational movements
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Lower compartment of disk performs what movement
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Hinge movement
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How is TMJ different from other joints
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It is not a weight bearing joint
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How does TMJ develop
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Develops from condensations of mesenchyme called blastemas
Temporal blastema appears first than Mandibular blastema |
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How does bone form in the TMJ
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endochondral bone formation
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Outer component of joint capsule
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dense collagenous fibrous sac
firmly attached to the condyle & loosely attached to the temporal bone |
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Inner component of joint capsule
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Contains thin vascular membrane
Type A Synovial cells produces hyuronidate mucous component of synovial fluid Type B Synovial cells produce protein component of synovial fluid |
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Synovial Fluid
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Functions to lubricate and provide nutrient and waste exchange to the bones
Type A Synovial cells produces hyuronidate mucous component of synovial fluid Type B Synovial cells produce protein component of synovial fluid |
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Layers of Condyle
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From outer to inner
Collagenous lining Fibrocartilage Hyaline Cartilage Compact bone Spongy bone |
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Layers of Temporal Fossa
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Outer to Inner
Collagenous lining parallel to bone Collagenous lining perpendicular to bone Compact bone Spongy bone (no fibrocartilage and hyaline cartilage like in condyles) |
