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Bursae - Pivot Joints rounded end of one bone protrudes...

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Bursae: flattened fibrous sacs lined with synovial membrane & containing film of synovial fluid - bunion: swollen bursa at base of big toe - Tendon Sheath: elongated bursa wrapped around a tendon Factors Influencing Stability of Synovial Joints: - articular surfaces: better fit = more stable - ligaments: generally, more ligaments = more stable... but ligaments may break if stressed; if only ligaments joining bones, poor stability - muscle tone: most important stabilizing factor for most joints o tendons kept taught by muscle tone - a low level of contractile activity in relaxed muscles Types of Synovial Joints: Plane Joints: flat articular surfaces, allow only short slipping or gliding movements - example: joints between vertebral articular processes Hinge Joints: cylindrical projection of one bone fits into trough-shaped surface on another - example: interphylangeal joints
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Unformatted text preview: Pivot Joints: rounded end of one bone protrudes into a bony ring/sleeve on another- example: atlas & axis articulation Condyloid (Ellipsoidal) Joints: oval articular surfaces of one bone fit into depression of another- example: radiocarpal joints Saddle Joints: resemble condyloid joints; each bone has both concave & convex articular surfaces (like saddle); greater freedom of movement- example: carpometacarpal joints Ball & Socket Joints: spherical (ball-shaped) head of one bone fits into cuplike socket of another- example: shoulder & hip joints Movements of Synovial Joints:- Nonaxial: slipping movement only; no axis- Uniaxial: movement in one plane- Biaxial: movement in two planes- Multiaxial: movement in multiple planes Gliding movements: flat or nearly flat bone glides over similar surface...
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Bursae - Pivot Joints rounded end of one bone protrudes...

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