Which statement best describes the Sartorius prime movements?

Which statement best describes the Sartorius prime movements?

• A. Abduction of the hip with medial rotation
• B. Flexion and internal rotation of the flexed knee
• C. Extension of the knee with external rotation
• D. Plantarflexion of the foot

Answer: (B)

The Sartorius acts across two joints, so its primary actions cover both hip and knee movements. At the hip, it helps flex the thigh, and it also abducts and externally rotates the hip. At the knee, when the knee is flexed, it assists in bending the knee and medially rotating the leg. That combination of knee flexion with medial (internal) rotation when the knee is flexed is the key thing the muscle does most characteristically. So the statement that captures its prime movements is flexion and internal rotation of the flexed knee. The other options either describe hip actions with the wrong rotation direction or describe movements the Sartorius doesn’t perform (such as knee extension or plantarflexion).

The Sartorius acts across two joints, so its primary actions cover both hip and knee movements. At the hip, it helps flex the thigh, and it also abducts and externally rotates the hip. At the knee, when the knee is flexed, it assists in bending the knee and medially rotating the leg. That combination of knee flexion with medial (internal) rotation when the knee is flexed is the key thing the muscle does most characteristically.

So the statement that captures its prime movements is flexion and internal rotation of the flexed knee. The other options either describe hip actions with the wrong rotation direction or describe movements the Sartorius doesn’t perform (such as knee extension or plantarflexion).