Lecture_1_27139 - The Joints Biol 1334 Lecture 12 Joints...

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The Joints Biol 1334 Lecture 12
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Joints Where two or more bones meet Also called an articulation Classified by function (the amount of movement they allow) and by structure (what is used to bind the bones together)
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Joint classification Movement: Synarthroses – immovable joints Amphithroses – slightly movable joints Diarthroses – freely movable Structure: Fibrous – joined by fibrous tissue Cartilaginous – joined by cartilage Synovial – bones are separated by fluid-filled cavities
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Fibrous Joints Sutures – lie between the bones of the skull Syndemoses – bones that are connected by ligaments Allow some give but dependent on the length of the ligament Example: Ulna + Radius Gomphoses – peg-in-socket joints Example: Teeth in the jaw
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Figure 8.1
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Cartilaginous joints Sychrondoses – junction of bone with cartilage Ex: epiphyseal plate; costal cartilage Symphyses – intervening pad of fibrocartilage between 2 bones Ex: vertebral discs
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Figure 8.2
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Synovial joints Possess articular cartilage to protect the bone ends Joint cavity filled with fluid Articular capsule enclosing the joint cavity that strengthens the joint Outer fibrous capsule Inner Synovial membrane Synovial fluid – secreted by the synovial membrane, provides a weight-bearing lubricant to the joint Reinforcing ligaments – reinforce and strengthen the joint
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Not part of the joint but closely associated Bursae – bags of fluid Act as ball-bearings where bone, muscle, Tendon sheaths – elongated bursae wrapped around a tendon
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Joints are stabilized by 3 factors Articular surface shape – allow movement at the joint but can hinder joint stability
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Lecture_1_27139 - The Joints Biol 1334 Lecture 12 Joints...

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