The soleus does what action?

The soleus does what action?

• A. Dorsiflexion
• B. Plantarflexion
• C. Inversion
• D. Eversion

Answer: (B)

The soleus is a powerful plantarflexor of the ankle. It sits in the posterior leg and inserts into the calcaneus via the Achilles tendon, working with the gastrocnemius as part of the triceps surae to push the foot downward. Plantarflexion means pointing the toes downward or standing on tiptoe, as opposed to dorsiflexion, which lifts the foot toward the shin. Inversion and eversion are movements at the subtalar joint that turn the sole medially or laterally, not primary actions of the soleus. The soleus is especially important for standing and endurance activities because it remains effective regardless of knee position (the gastrocnemius crosses the knee and is less effective when the knee is flexed), whereas plantarflexion becomes limited if those knee-dependent muscles are not optimally lengthened.

The soleus is a powerful plantarflexor of the ankle. It sits in the posterior leg and inserts into the calcaneus via the Achilles tendon, working with the gastrocnemius as part of the triceps surae to push the foot downward. Plantarflexion means pointing the toes downward or standing on tiptoe, as opposed to dorsiflexion, which lifts the foot toward the shin. Inversion and eversion are movements at the subtalar joint that turn the sole medially or laterally, not primary actions of the soleus. The soleus is especially important for standing and endurance activities because it remains effective regardless of knee position (the gastrocnemius crosses the knee and is less effective when the knee is flexed), whereas plantarflexion becomes limited if those knee-dependent muscles are not optimally lengthened.