Which option best describes the support for the medial longitudinal arch besides tibialis posterior?

• A. Intrinsic foot muscles
• B. Intrinsic foot muscles and plantar fascia
• C. Plantar fascia
• D. Tibialis anterior

Answer: (B)

Support for the medial longitudinal arch comes from both passive structures and active muscular control. The plantar fascia runs from the calcaneus to the toes and acts like a tie beam that maintains arch height; when the toes rise and the windlass mechanism tightens, the arch is elevated and resisted against flattening during weight-bearing. Intrinsic foot muscles, located within the foot itself, provide dynamic stabilization by actively adjusting tension and support of the arch as we move and load the foot. Together, these intrinsic muscles plus the plantar fascia give substantial, functional support to the arch even when tibialis posterior isn’t considered. In contrast, the plantar fascia alone lacks active control, intrinsic muscles alone lack the passive tension, and the tibialis anterior is not a primary arch stabilizer.