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Joints are the articulations between bones. Two ways to classify types of joints are based upon their structure and function.
The structural classification of joints breaks down into fibrous joints, cartilagenous joints, and synovial joints. The functional classification of joints breaks into the subdivisions of immovable, slightly movable or freely movable.
6 Types of Synovial Joints
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Ball and Socket |
This type of joint permits movement in all directions. Two examples are the hip and shoulder joints. |
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Gliding |
Just like it seems - two surfaces glide past one another. Example = the joints between the carpals. |
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Condyloid |
Similiar to a ball and socket, but movement is more restricted. Allows two way movement. |
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Hinge |
Permits movements of flexion and extension only . Example = the elbow. |
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Pivot |
An example of this type of joint is the articulation between the atlas and axis (C1 and C2), which allows the head to rotate from side to side (in the "no" motion). |
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Saddle |
Example = the thumb. |
Terms for Types of Movements of Synovial Joints
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Extension |
Increasing the angle. In the anatomical position everything is extended. |
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Hyperextension |
To increase the angle beyond the anatomical position. |
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Flexion |
Decreasing the angle. |
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Plantar Flexion |
To point the toe. |
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Dorsiflexion |
Pulls the toes up. |
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Abduction |
Moving a limb away from the trunk of the body. |
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Adduction |
Moving a limb toward the trunk of the body. |
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Rotation |
Movement of a bone around an axis. |
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Circumduction |
Circular movement of the distal end of a limb. |
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Supination |
The palm in the anatomical position (palms forward). |
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Pronation |
Palms backward. |
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Inversion |
Turning the sole of the foot inward. |
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Eversion |
Turning the sole of the foot outward. |
Synovial Joint Structure
Synovial joints have bones covered at their articulating surfaces with articular cartilage (Hyaline cartilage). The fluid filled synovial cavity is surrounded by the synovial membrane, which secretes the fluid for lubrication, and the joint capsule. The bones are held together by ligaments.
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