This medical illustration describes the action of flexor hallucis longus muscle and tendon during the toe-off phase of gait for medical and anatomy students. Flexor hallucis longus m. originates on the fibular side of the leg, the fibers of the muscle converge into a long tendon that passes a separate synovial sheath. The tendon passes under the sustentaculum tali of the calcaneus. The flexor hallucis longus tendon crosses diagonally in the sole of the foot and inserts into the distal phalanx of the big toe. Gait analysis is an important factor to diagnose underlying pathologies affecting the walking ability of humans and animals.
Flexor hallucis longus, although the muscle originates on the fibula, it inserts into the very tip of the big toe. The muscle and tendon together can exert force about 50% body weight. When illustrating this plate, I worked with an anatomist and gait specialist to place the tendons in the accurate positions.
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