10 Questions
In joint movement, what happens to the convex joint surface when the body segment's motion is upward?
It rotates down
What does the cupped right hand represent in the joint demonstration?
Concave surface of the other bone
When raising the left elbow, how does the cupped right hand move in relation to the left fist?
Moves up and over the left fist
What happens to the left fist when the left forearm moves up during the joint demonstration?
It rotates down
Which type of joint surface will move on a fixed concave surface in the opposite direction as the moving body segment?
Convex joint surface
During finger extension, which joint surface moves in the same direction as the phalanx itself while moving on the convex metacarpal joint surface?
Concave joint surface
What type of joint surface moves on a fixed convex surface in the same direction the body segment is moving?
Concave joint surface
Which bone end shape requires joint surfaces to move in a specific way during joint movement?
Concave bone end
What is the movement direction of a convex joint surface on a fixed concave surface during shoulder flexion?
Downward
What determines how joint surfaces need to move during joint movement?
Shape of bone ends
Study Notes
Joint Movement
- When the body segment moves upward, the convex joint surface moves downward.
- The cupped right hand in the joint demonstration represents the concave joint surface.
- When raising the left elbow, the cupped right hand moves downward in relation to the left fist.
- When the left forearm moves up during the joint demonstration, the left fist moves upward.
- A concave joint surface will move in the opposite direction as the moving body segment on a fixed convex surface.
- During finger extension, the concave joint surface of the phalanx moves in the same direction as the phalanx itself while moving on the convex metacarpal joint surface.
- A concave joint surface moves on a fixed convex surface in the same direction the body segment is moving.
- The bone end shape that requires joint surfaces to move in a specific way during joint movement is the convex-concave joint surface.
- During shoulder flexion, the convex joint surface moves upward on a fixed concave surface.
- The bone end shape determines how joint surfaces need to move during joint movement.
Test your knowledge about the concave-convex rule, which describes how the differences in shapes of bone ends require joint surfaces to move in a specific way during joint movement. Understand how a concave joint surface moves on a fixed convex surface in the same direction as the body segment.
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