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Joints are the articulations between bones.  Two ways to classify types of joints are based upon their structure and function.

 

6 Types of Synovial Joints

Ball and Socket

This type of joint permits movement in all directions.  Two examples are the hip and shoulder joints.

Gliding

Just like it seems - two surfaces glide past one another.  Example = the joints between the carpals.

Condyloid

Similiar to a ball and socket, but movement is more restricted.  Allows two way movement.

Hinge

Permits movements of flexion and extension only .  Example = the elbow.

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).

Saddle

Example = the thumb.  

 

Terms for Types of Movements of Synovial Joints

Extension

Increasing the angle.  In the anatomical position everything is extended.

Hyperextension

To increase the angle beyond the anatomical position.

Flexion

Decreasing the angle.

Plantar Flexion

To point the toe.

Dorsiflexion

Pulls the toes up.

Abduction

Moving a limb away from the trunk of the body.

Adduction

Moving a limb toward the trunk of the body.

Rotation

Movement of a bone around an axis.

Circumduction

Circular movement of the distal end of a limb.

Supination

The palm in the anatomical position (palms forward).

Pronation

Palms backward.

Inversion

Turning the sole of the foot inward.

Eversion

Turning the sole of the foot outward.

 

Synovial Joint Structure

Image 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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