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Joints

Joints. Do Now. How many different motions can the following exhibit? Shoulder Elbow Knee Wrist. What are Joints?. The place where two bones interconnect Also called articulations Characteristics determined by function. Types of Joints. Immovable (synarthoses)

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Joints

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  1. Joints

  2. Do Now • How many different motions can the following exhibit? • Shoulder • Elbow • Knee • Wrist

  3. What are Joints? • The place where two bones interconnect • Also called articulations • Characteristics determined by function

  4. Types of Joints • Immovable (synarthoses) • bones sutured together by connective tissue • skull • Slightly movable (amphiarthoses) • connected by fibrocartilage or hyaline cartilage • vertebrae, rib/sternum joint, pubic (symphysis) • Freely movable (diarthroses)- separated • ligaments- hold bones together • tendons- muscle to bone • lined by synovial membrane

  5. Types of Moveable Joints • Ball-and-socket joints • formed when a rounded head of one bone fits into the rounded cavity of an jointed bone • Shoulder and hip • Hinge joints • Allow bone to bend and straighten • include elbow, knee, ankle, and fingers • Gliding • Sliding and twisting • Wrist and ankle

  6. Types of Moveable Joints • Pivot joints • allow limited rotation or turning of the head • Ellipsoidal joints • bone in wrist, and a oval shaped part that fits in a curved space • the joints slide over each other

  7. Structure of a Synovial Joint • Articular capsule • Surrounds the synovial joint • Synovial membrane lines the walls of the articular cavity • Synovial fluid fills the joint cavity • Bony surfaces covered by articular cartilages • Reduce friction

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