In which plane does flexion occur?

Flexion occurs in the sagittal plane, which divides the body into left and right halves. This movement involves decreasing the angle between two body parts, such as bending the elbow or knee. When you flex your arm, for example, the movement takes place forward in relation to the body's midline, which corresponds to the movements defined within the sagittal plane.

Other planes mentioned have distinct movement characteristics. The coronal plane, or frontal plane, is associated with movements that occur sideways, such as abduction and adduction. The transverse plane involves rotational movements around the body's axis, like twisting. The oblique plane refers to movements that occur diagonally between the sagittal and transverse or coronal planes, which would not specifically pertain to flexion. Thus, the sagittal plane is the correct context for flexion.