What action does the adductor brevis perform?

What action does the adductor brevis perform?

• A. Adduction of thigh
• B. Flexion of thigh
• C. Extension of thigh
• D. Adduction and medial rotation of thigh

Answer: (D)

The adductor brevis is a medial thigh muscle whose job is to pull the thigh toward the midline. It originates from the inferior pubic ramus and inserts on the proximal part of the linea aspera and pectineal line, so its contraction adducts the femur. In addition, because its fibers cross the hip in a way that can rotate the thigh inward, it assists with medial rotation, especially when the thigh is flexed. It is not a primary mover for extending the thigh, and while it can contribute to flexion, the combination of adduction with medial rotation best captures its usual action.

The adductor brevis is a medial thigh muscle whose job is to pull the thigh toward the midline. It originates from the inferior pubic ramus and inserts on the proximal part of the linea aspera and pectineal line, so its contraction adducts the femur. In addition, because its fibers cross the hip in a way that can rotate the thigh inward, it assists with medial rotation, especially when the thigh is flexed. It is not a primary mover for extending the thigh, and while it can contribute to flexion, the combination of adduction with medial rotation best captures its usual action.