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Anatomy 1--Joints
Joints of the body
Term | Definition |
---|---|
Synarthrosis | Immovable joints |
Amphiarthrosis | Slightly movable joints |
Diarthrosis | Freely movable joints |
Fibrous Joints | Connected by fibrous tissues, namely dense fibrous connective tissue. |
Sutures | Wavy articulating bone edges that interlock and found only in the skull. |
Gomphosis | Peg-in-socket fibrous joint found only in the teeth. |
Cartilaginous Joints | Connected by cartilage. There is no joint cavity present and are not highly movable |
Synchondrosis | A joint in which a bar or plate of hyaline cartilage connects the bones. Growth plates in children. |
Symphysis | Fibrocartilage uniting the bone, acting as a shock absorber and permits a limited amount of movement. |
Synovial Joints | Separated by a fluid-containing joint cavity which allows a substantial freedom of movement. Nearly all joints of the limbs, and most joints of the body, fall into this category |
Synovial Joint breakdown | Articular cartilage, Joint/articular cavity, Articular Capsule, Fibrous layer, Synovial membrane, and Synovial Fluid. |
Articular Discs | An inward extension of the articular capsule that completely divides the synovial cavity in 2. |
Menisci | An inward extension of the articular capsule that partially divides the synovial cavity in 2. |
Bursae | Flattened fibrous sacs lined with synovial memebrane and a thin film of synovial fluid. "Ball Bearings". |
Tendon Sheaths | An elongated bursae that wraps completely around the tendon. |
Synovial Joint movements | Gliding movements, Rotation and Angular Movements |
Gliding movements | Occurs when one flat bone glides over another |
Rotation | The turning of a bone around it's own axis |
Angular Movements | Movements that increase or decrease the angle between 2 bones |
Medial Rotation | Internal rotation. When a joint rotates the limb turns in towards the midline |
Lateral Rotation | External rotation. Rotation swings the limb from the midline |
Lateral Flexion | Only at axial skeleton. Neck or vertebral column bends laterally to the side |