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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 |