Concave-Convex Rule in Joint Movement

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Questions and Answers

In joint movement, what happens to the convex joint surface when the body segment's motion is upward?

  • It moves in the same direction as the body segment
  • It rotates down (correct)
  • It remains stationary
  • It rotates up

What does the cupped right hand represent in the joint demonstration?

  • Concave surface of one bone
  • Convex joint surface of one bone
  • Convex joint surface of the other bone
  • Concave surface of the other bone (correct)

When raising the left elbow, how does the cupped right hand move in relation to the left fist?

  • Remains at the same level as the left fist
  • Moves up and over the left fist (correct)
  • Rotates around the left fist
  • Moves down and under the left fist

What happens to the left fist when the left forearm moves up during the joint demonstration?

<p>It rotates down (A)</p> Signup and view all the answers

Which type of joint surface will move on a fixed concave surface in the opposite direction as the moving body segment?

<p>Convex joint surface (C)</p> Signup and view all the answers

During finger extension, which joint surface moves in the same direction as the phalanx itself while moving on the convex metacarpal joint surface?

<p>Concave joint surface (A)</p> Signup and view all the answers

What type of joint surface moves on a fixed convex surface in the same direction the body segment is moving?

<p>Concave joint surface (D)</p> Signup and view all the answers

Which bone end shape requires joint surfaces to move in a specific way during joint movement?

<p>Concave bone end (A)</p> Signup and view all the answers

What is the movement direction of a convex joint surface on a fixed concave surface during shoulder flexion?

<p>Downward (A)</p> Signup and view all the answers

What determines how joint surfaces need to move during joint movement?

<p>Shape of bone ends (C)</p> Signup and view all the answers

Flashcards

Convex Joint Surface Movement

In joint movement, the convex joint surface rotates down when the body segment's motion is upward.

Cupped Hand Representation

In a joint demonstration, the cupped hand represents the concave surface of a bone.

Elbow Raising Demonstration

When raising the left elbow, the cupped right hand moves up and over the left fist in the joint demonstration.

Forearm Movement and Fist Rotation

During the joint demonstration when the left forearm moves up, the left fist rotates down.

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Movement on Fixed Concave Surface

The convex joint surface moves in the opposite direction as the moving body segment when moving on a fixed concave surface.

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Finger Extension Movement

During finger extension, the concave joint surface moves in the same direction as the phalanx itself while moving on the convex metacarpal joint surface.

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Movement on Fixed Convex Surface

The concave joint surface moves on a fixed convex surface in the same direction the body segment is moving.

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Concave Bone End Requirement

A concave bone requires joint surfaces to move in a specific way during joint movement.

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Shoulder Flexion Movement

During shoulder flexion, a convex joint surface moves downward on a fixed concave surface.

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Joint Movement Determinant

The shape of bone ends determines how joint surfaces need to move during joint movement.

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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.

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