MEDICAL PHYSIOLOGY

Detailed explanation-1: -Antagonists are plantar-flexors of the posterior compartment such as soleus and gastrocnemius. The movements of tibialis anterior are dorsiflexion and inversion of the ankle. However, actions of tibialis anterior are dependent on whether the foot is weight bearing or not (closed or open kinetic chain).

Detailed explanation-2: -Plantar flexion takes place at the ankle (hinge joint). When the gastrocnemius relaxes and lengthens (antagonist) the tibialis anterior contracts and shortens (agonist).

Detailed explanation-3: -There’s one muscle on the front of the leg for dorsiflexion, tibialis anterior. There are three on the back of the leg for plantar flexion, gastrocnemius, soleus, and plantaris. Here’s tibialis anterior. Tibialis anterior arises from the lateral surface of the upper tibia, and from the interosseous membrane.

Detailed explanation-4: -Function. Tibialis anterior is the primary dorsiflexor of the ankle with synergistic action of extensor hallicus longus, extensor digitorium longus and peroneous tertius.

Detailed explanation-5: -Its antagonist is the tibialis anterior muscle at the front of the calf. The soleus muscle is a synergist in plantar flexion.