Select all agonist ankle joint muscles active (contracting) from B to A.

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Let's unpack what the question is asking: identify all agonist ankle joint muscles active (contracting) from B to A. We own a list of muscle options to choose from.
Option: tibialis anterior
- This muscle is the primary dorsiflexor of the ankle, meaning it flexes the foot upward (toward the shin). If the movement from B to A involves dorsiflexion, the tibialis anterior would be actively contracting as an agonist. This aligns with standard biomechanical action of the muscle.
Option: tibialis posterior
- The tibialis posterior mainly contributes to plantarflexion and inversion of the foot. It is not a primary dorsiflexor, so it would not be the main agonist for a dorsiflexion movement from B to A. Its action would oppose dorsiflexion, making it more of a stabilizer or contributor to different movements depending on the plane, but not the primary agonist for dorsiflexion.
Option: soleus
- The soleus is a strong plantarflexor of the ankle, particularly when the knee is extended. If the movement from B to A is dorsiflexion, the soleus would act antagonistically to the dorsiflexion motion, not as an agonist. Therefore, it would not be considered an agonist in this context.
Option: peroneus longus
- The peroneus longus (fibularis longus) primarily everts the foot and can assist with plantarflexion. While it has a role in stabilizing the lateral side of the foot, it is not a primary dorsiflexor. Thus it would not be the main agonist for dorsiflexion from B to A.
Option: gastrocnemius
- The gastrocnemius is a powerful plantarflexor, crossing the knee and ankle. When focusing on ankle movement alone, its primary action is plantarflexion, not dorsiflexion. In a dorsiflexion movement, the gastrocnemius would oppose the motion, not act as an agonist.
Option: popliteus
- The popliteus unlocks the knee by initiating knee rotation but does not drive ankle dorsiflexion directly. Its action is more about knee mechanics rather than being a primary ankle dorsiflexor. Therefore, it would not be considered an agonist for dorsiflexion at the ankle.
In summary, when considering the movement from B to A as dorsiflexion at the ankle, the primary agonist muscle among the options is tibialis anterior, while all other listed muscles either perform plantarflexion, inversion, eversion, or knee-related actions rather than dorsiflexion. The reasoning for each incorrect option hinges on their primary actions at the ankle and whether those actions align with or oppose dorsiflexion.

2025FA-HES-207-001 E. Movement Analysis - LE

Select all agonist ankle joint muscles active (contracting) from B to A.

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