Question at position 15 Which of the following muscles does not belong with the others?Flexor hallucis longusGastrocnemiusSoleusExtensor hallucis longusTibialis posterior

Question

BlackTom AI · Accepted Answer

To determine which muscle doesn’t belong, we should compare their primary actions and general muscle groups in the leg.
Option 1: Flexor hallucis longus — this muscle primarily plantarflexes the ankle and flexes the big toe, contributing to stability during walking and push-off. It is a plantarflexor and toe flexor.
Option 2: Gastrocnemius — along with the soleus, it forms the calf muscle complex and mainly plantarflexes the foot at the ankle; it also crosses the knee. It is a plantarflexor.
Option 3: Soleus — a strong plantarflexor of the foot, lying deep to the gastrocnemius, and essential for standing and locomotion. Also in the plantarflexor group.
Option 4: Extensor hallucis longus — this muscle extends the big toe and dorsiflexes the foot, i.e., it is an extensor and dorsiflexor, not a plantarflexor. This sets it apart from the others in the list.
Option 5: Tibialis posterior — this muscle plantarflexes and inverts the foot, contributing to arch support and foot stability. It is a plantarflexor and inverter.
In summary, four muscles (flexor hallucis longus, gastrocnemius, soleus, tibialis posterior) are primarily involved in plantarflexion (or related stabilization), whereas extensor hallucis longus is an extensor and dorsiflexor. Therefore, Extensor hallucis longus is the odd one out because its primary action is extension/dorsiflexion of the big toe, not plantarflexion.

Question at position 15 Which of the following muscles does not belong with the others?Flexor hallucis longusGastrocnemiusSoleusExtensor hallucis longusTibialis posteriorSingle choice

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