Multiple Choice
In muscle actions, which term describes a muscle that opposes or reverses the movement produced by the prime mover (agonist)?
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10. Muscles
Muscle Actions
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Which muscle is the prime mover (agonist) of dorsiflexion at the ankle?
A
Gastrocnemius
B
Tibialis anterior
C
Soleus
D
Fibularis (peroneus) longus
Verified step by step guidance1
Understand the movement in question: dorsiflexion at the ankle refers to the action of lifting the foot upwards towards the shin.
Identify the muscles involved in ankle movements: the gastrocnemius and soleus primarily perform plantarflexion (pointing the foot downward), while the fibularis (peroneus) longus mainly causes eversion and plantarflexion.
Recall that the prime mover (agonist) is the muscle that is primarily responsible for producing a specific movement—in this case, dorsiflexion.
Recognize that the tibialis anterior is located on the front of the lower leg and is the main muscle responsible for dorsiflexion of the foot at the ankle joint.
Conclude that the tibialis anterior is the prime mover (agonist) for dorsiflexion at the ankle because it contracts to lift the foot upward.
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