Read the following descriptions of synovial joints, then click and drag them into the correct box to identify which type of s each represents. This is biaxial joint, in which both bones are concave in one direction and convex in the other. This joint is described as adjacent bones that slide over each other with relatively limited movement. This is a multiaxial joint. This is a biaxial joint with an oval convex surface on one bone that fits into a concave depression on the other. This is a monaxial joint, in which a bone spins on its longitudinal axis. Saddle Joint Pivot Joint This is a monaxial joint, moving freely in one plane with very little movement in any other. Ball-and-socket Joint Hinge Joint Plane Joint Condylar Joirk
The Correct Answer and Explanation is:
Of course. Here are the correct matches for the descriptions of the synovial joints.
- Saddle Joint: This is a biaxial joint, in which both bones are concave in one direction and convex in the other.
- Pivot Joint: This is a monaxial joint, in which a bone spins on its longitudinal axis.
- Ball-and-socket Joint: This is a multiaxial joint.
- Hinge Joint: This is a monaxial joint, moving freely in one plane with very little movement in any other.
- Plane Joint: This joint is described as adjacent bones that slide over each other with relatively limited movement.
- Condylar Joint: This is a biaxial joint with an oval convex surface on one bone that fits into a concave depression on the other.
Explanation of Synovial Joints
Synovial joints are the most common and most movable type of joint in the body. They are classified into six main categories based on the shape of the articulating bone surfaces, which dictates the type and range of motion possible at each joint.
Monaxial Joints allow movement in a single plane. The hinge joint, like the elbow or knee, works like a door hinge, permitting only flexion and extension. The pivot joint also allows monaxial movement, but this movement is rotational. In a pivot joint, a rounded portion of a bone spins within a ring formed by another bone and a ligament, as seen in the joint that allows you to shake your head “no”.
Biaxial Joints permit movement in two planes. A condylar joint features an oval shaped convex surface on one bone that articulates with a concave depression on another. This structure allows for flexion and extension as well as abduction and adduction, as seen in the wrist joint. The saddle joint is another biaxial type where each articulating surface has both a concave and a convex area, fitting together like a rider on a saddle. This unique shape, found in the thumb’s carpometacarpal joint, allows for a similar range of motion to a condylar joint but with greater movement.
Multiaxial and Other Joints offer the greatest or most specialized movement. The ball and socket joint is multiaxial, meaning it can move in all three anatomical planes. A rounded, ball like end of one bone fits into a cup like socket of another, allowing for flexion, extension, abduction, adduction, and rotation. The shoulder and hip are primary examples. Finally, the plane joint, also known as a gliding joint, has flat or slightly curved articulating surfaces. These surfaces slide or glide over one another, providing limited movement, as seen between the carpal bones of the wrist.
