Final answer:
The tendon of the fibularis brevis muscle is located in the ankle and is responsible for evertion of the foot and plantar flexion at the ankle joint.
Step-by-step explanation:
The tendon of the fibularis brevis muscle is located in the ankle. The fibularis brevis muscle is one of the muscles in the lateral compartment of the leg. It helps to evert the foot (turn it outward) and is responsible for plantar flexion (pointing the toes downward) at the ankle joint.