Which muscle originates from the linea aspera?

Which muscle originates from the linea aspera?

• A. Vastus Lateralis
• B. Adductor Longus
• C. Gracilis
• D. Rectus Femoris

Answer: (A)

Linea aspera is a vertical ridge on the posterior femur that serves as a major attachment site for thigh muscles. The vastus lateralis originates from the lateral lip of the linea aspera, placing it in a position to contribute to knee extension as part of the quadriceps mechanism. The other muscles listed arise from the pelvis or pubic region (adductor longus from pubis; gracilis from inferior pubic ramus) or from the AIIS (rectus femoris), not from the linea aspera. So, the muscle that starts from the linea aspera is the vastus lateralis.

Linea aspera is a vertical ridge on the posterior femur that serves as a major attachment site for thigh muscles. The vastus lateralis originates from the lateral lip of the linea aspera, placing it in a position to contribute to knee extension as part of the quadriceps mechanism. The other muscles listed arise from the pelvis or pubic region (adductor longus from pubis; gracilis from inferior pubic ramus) or from the AIIS (rectus femoris), not from the linea aspera. So, the muscle that starts from the linea aspera is the vastus lateralis.