The body of the femur has which muscle attached to it?

• A. Vastus Intermedius
• B. Pectineus
• C. Rectus Femoris
• D. Iliopsoas

Answer: (A)

This question tests where thigh muscles attach to the femur, focusing on the shaft (the body) versus proximal regions. Vastus intermedius originates from the anterior and lateral surfaces of the femoral body (shaft), lying deep to the rectus femoris, and it contributes to knee extension via the quadriceps tendon to the patella and then the patellar ligament to the tibial tuberosity. The other muscles listed do not originate from the femoral shaft: rectus femoris comes from the AIIS and the acetabular rim, pectineus from the superior pubic ramus and inserts on the proximal femur, and iliopsoas inserts at the lesser trochanter. Thus, the body of the femur is attached by the vastus intermedius.