The axis involved in elbow flexion is which?

The axis involved in elbow flexion is which?

• A. Sagittal axis
• B. Longitudinal axis
• C. Transverse axis
• D. Frontal axis

Answer: (D)

Elbow flexion happens in the sagittal plane, which divides the body into left and right halves. The rotation for movements in that plane occurs about a frontal axis, a line that runs from side to side across the body (left to right). So bending the elbow involves rotation around this side-to-side axis. Ruling out other axes: rotating about a vertical line would twist the limb rather than bend the elbow, and the axis described for movements in the other planes doesn’t match the bending action seen in elbow flexion.

Elbow flexion happens in the sagittal plane, which divides the body into left and right halves. The rotation for movements in that plane occurs about a frontal axis, a line that runs from side to side across the body (left to right). So bending the elbow involves rotation around this side-to-side axis.

Ruling out other axes: rotating about a vertical line would twist the limb rather than bend the elbow, and the axis described for movements in the other planes doesn’t match the bending action seen in elbow flexion.