During plantar flexion, which muscle acts as the antagonist to the gastrocnemius?

During plantar flexion, which muscle acts as the antagonist to the gastrocnemius?

• A. Tibialis anterior
• B. Soleus
• C. Plantaris
• D. Popliteus

Answer: (A)

Antagonist muscles oppose the action of the prime mover. For plantar flexion of the ankle, the calf muscles (gastrocnemius and soleus) push the foot downward. The muscle that pulls the foot upward, opposing that action, is the tibialis anterior, which dorsiflexes the ankle (lifts the front of the foot). That makes it the best answer. The soleus and plantaris assist plantar flexion, not oppose it; the popliteus mainly affects knee rotation and unlocking the knee, not the ankle’s plantar flexion.

Antagonist muscles oppose the action of the prime mover. For plantar flexion of the ankle, the calf muscles (gastrocnemius and soleus) push the foot downward. The muscle that pulls the foot upward, opposing that action, is the tibialis anterior, which dorsiflexes the ankle (lifts the front of the foot). That makes it the best answer. The soleus and plantaris assist plantar flexion, not oppose it; the popliteus mainly affects knee rotation and unlocking the knee, not the ankle’s plantar flexion.