The insertion of the psoas is on which structure?

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Multiple Choice

The insertion of the psoas is on which structure?

The important idea is where the psoas tendon attaches to the femur. The psoas major (as part of the iliopsoas) inserts on the lesser trochanter of the femur. This placement lets the psoas act as a powerful hip flexor, pulling the thigh upward toward the torso when it contracts. The tendon comes from the lumbar region, passes under the inguinal ligament, and then attaches at that quieter, smaller bump on the femur, which is exactly the lesser trochanter. Why the other structures aren’t correct: the greater trochanter is where the gluteal muscles insert, not the psoas; the intertrochanteric line is a boundary between the greater and lesser trochanters, not an insertion site; the linea aspera runs along the femoral shaft and serves as an attachment for other thigh muscles, but not for the psoas.

The important idea is where the psoas tendon attaches to the femur. The psoas major (as part of the iliopsoas) inserts on the lesser trochanter of the femur. This placement lets the psoas act as a powerful hip flexor, pulling the thigh upward toward the torso when it contracts. The tendon comes from the lumbar region, passes under the inguinal ligament, and then attaches at that quieter, smaller bump on the femur, which is exactly the lesser trochanter.

Why the other structures aren’t correct: the greater trochanter is where the gluteal muscles insert, not the psoas; the intertrochanteric line is a boundary between the greater and lesser trochanters, not an insertion site; the linea aspera runs along the femoral shaft and serves as an attachment for other thigh muscles, but not for the psoas.

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