What is the action of the plantaris muscle during gait?

The plantaris muscle primarily functions as an auxiliary muscle contributing to plantarflexion, especially during the push-off phase of gait. During walking or running, as one transitions from the stance phase to the swing phase, the plantaris assists the gastrocnemius and soleus muscles to elevate the heel and propel the body forward. Though its role is not as significant due to its relatively small size and length, it still plays a part in generating force and aiding in the coordinated movement necessary for effective push-off.

Understanding this function clarifies its importance in dynamic movements, allowing for more efficient locomotion. In addition to plantar flexion, the muscle also provides slight assistance in stabilizing the ankle joint, but its main action is directly related to push-off during gait.