Complete the Concept Map to name and describe the common body movements and the types of synovial joints involved. Drag the appropriate labels to their respective targets. (Note: If two labels can be equally placed in two targets, the labels should be placed in alphabetical order from top to bottom.) View Available Hint(s) is/are uniaxial, allowing pivot joints for the movement(s) of is/are uniaxial, allowing hinge joints for the movement(s) of rotation saddle joints is/are biaxial, allowing for the movement(s) of flexion and extension condylar joints is/are biaxial, allowing for the movement(s) of adduction and abduction ball-and-socket joints is/are multiaxial, allowing for the movement(s) of Reset Help You labeled 2 of 8 targets incorrectly. You have incorrectly placed “condylar joints”. Condylar joints allow for movement in two planes. The wrist joint is a condylar joint. No credit lost. Try again.
The Correct Answer and Explanation is:
Based on the feedback provided in the image, the error lies in the placement of the “condylar joints” and “saddle joints” labels. Both are biaxial joints allowing for the same types of movement, so they must be placed according to the alphabetical rule mentioned in the instructions.
Here is the correct organization for the concept map:
- Pivot joints are uniaxial, allowing for rotation.
- Hinge joints are uniaxial, allowing for flexion and extension.
- Condylar joints are biaxial, allowing for flexion and extension and adduction and abduction.
- Saddle joints are biaxial, allowing for flexion and extension and adduction and abduction.
- Ball-and-socket joints are multiaxial, allowing for flexion and extension, adduction and abduction, and rotation.
Explanation of Synovial Joints and Movements
Synovial joints are the most common and most movable type of joint in the body. They are classified based on their structure and the number of axes of motion they permit. This concept map correctly categorizes them as uniaxial, biaxial, and multiaxial.
Uniaxial Joints
Uniaxial joints allow movement in only one plane. The map correctly identifies two types. Pivot joints feature a rounded bone fitting into a ring formed by another bone and ligaments, permitting only rotation around a longitudinal axis. A key example is the joint between the first two cervical vertebrae (the atlas and axis), which allows you to shake your head “no”. Hinge joints, on the other hand, have a convex surface fitting into a concave surface, allowing only flexion and extension, much like a door hinge. The elbow and knee joints are classic examples of hinge joints.
Biaxial Joints
Biaxial joints permit movement in two planes. The error in the original attempt was related to this category. Both condylar joints and saddle joints are biaxial, allowing for flexion, extension, adduction, and abduction. Condylar joints, like the wrist (radiocarpal) joint, have an oval-shaped condyle that fits into an elliptical depression. Saddle joints, such as the carpometacarpal joint of the thumb, have unique saddle-shaped surfaces that interlock. Because both joint types fit the same functional description in the map, the instruction to place them in alphabetical order is critical. “Condylar” comes before “Saddle” alphabetically, so condylar joints should be listed first.
Multiaxial Joints
Multiaxial joints allow movement in all three anatomical planes. Ball-and-socket joints are the only type in this category. They consist of a spherical head of one bone fitting into a cup-like socket of another. This configuration provides the greatest range of motion, including flexion, extension, adduction, abduction, and rotation. The shoulder and hip joints are the body’s primary ball-and-socket joints, offering extensive mobility.
