What is the term for medial-rotational movement toward the midline in the transverse plane?

What is the term for medial-rotational movement toward the midline in the transverse plane?

• A. External rotation
• B. Internal rotation
• C. Adduction
• D. Horizontal adduction

Answer: (D)

Internal rotation describes medial rotation toward the midline in the transverse plane. When a limb turns so its front surface moves toward the body's midline, that's internal rotation, a motion you see at the shoulder and hip joints. External rotation is the opposite, moving away from the midline. Adduction means moving toward the midline in the frontal plane, not specifically about rotation in the transverse plane, and horizontal adduction is a movement toward the midline in the horizontal plane that may involve other motions, but the precise term for medial rotation is internal rotation.

Internal rotation describes medial rotation toward the midline in the transverse plane. When a limb turns so its front surface moves toward the body's midline, that's internal rotation, a motion you see at the shoulder and hip joints. External rotation is the opposite, moving away from the midline. Adduction means moving toward the midline in the frontal plane, not specifically about rotation in the transverse plane, and horizontal adduction is a movement toward the midline in the horizontal plane that may involve other motions, but the precise term for medial rotation is internal rotation.