Which of the following movements occurs in the sagittal plane?

In the context of human movement, the sagittal plane divides the body into right and left halves. Movements that occur within this plane involve forward and backward motion. Flexion is the bending of a joint that decreases the angle between two body parts, typically moving a limb closer to the body or down towards the ground. This motion directly aligns with the characteristics of the sagittal plane, as it predominantly involves movements like bending at the elbow or knee.

In contrast, abduction is a movement that occurs in the frontal plane, where a limb moves away from the midline of the body. Rotation refers to circular movement around an axis and occurs in the transverse plane. Elevation involves lifting a body part superiorly, which also does not fit within the sagittal plane’s definition. Thus, flexion is the only movement listed that appropriately aligns with the sagittal plane's characteristics, making it the correct answer.