What describes medial (internal) rotation?

Medial (internal) rotation refers to the movement of a joint where a limb or body part is turned inward towards the midline of the body. This means that during medial rotation, the structure is rotating around an axis in a way that brings it closer to the center of the body.

Focusing on the correct response, it clearly describes this inward movement, indicating the rotational direction relative to the body's midline. For instance, when considering the shoulder joint, medial rotation occurs when the arm is turned so that the thumb moves closer to the body.

The other options do not accurately represent this movement. For instance, the option that describes rotation around an axis "from the center" implies an outward movement, which contrasts with medial rotation. Additionally, movements concerning the scapula's superior border and its relationship to the midline pertain to elevation and retraction rather than the specific action of internal rotation. Thus, the choice that highlights movement around an axis towards the center aligns perfectly with the definition of medial (internal) rotation.