The tibialis anterior origin includes which structures?

• A. Distal phalanges of toes
• B. Lateral condyle of tibia; proximal, lateral surface of tibia and Interosseous membrane
• C. Posterior surface of fibula
• D. Medial condyle of femur

Answer: (B)

Understanding where a muscle begins helps explain its path and what it can do. The tibialis anterior starts from the lateral condyle of the tibia, the proximal lateral surface of the tibia, and the interosseous membrane between the tibia and fibula. This set of attachments lets the muscle tendon run down the front of the leg to the foot, enabling dorsiflexion and inversion. The other options point to different structures: distal phalanges are related to toe-extensor insertions, the posterior surface of the fibula is associated with muscles like tibialis posterior, and the medial condyle of the femur is a site for muscles that extend the knee. Thus, the listed tibial attachments and interosseous membrane correctly define the tibialis anterior origin.