Contraction of the fibularis tertius moves the foot ______.Multiple choice question.so the plantar surface faces mediallyupwarddownward

The correct answer to the question is "upward."

Explanation

The fibularis tertius is a muscle located on the anterior compartment of the lower leg. It is primarily responsible for the dorsiflexion of the foot, which means it helps to pull the foot upward towards the shin. When the fibularis tertius contracts, it also assists in eversion of the foot, which involves turning the sole (plantar surface) of the foot outward. However, its primary action relevant to this question is dorsiflexion.

In the context of the answer choices given:

• So the plantar surface faces medially: This refers to inversion, which is not the primary action of the fibularis tertius.
• Upward: This is correct as this reflects dorsiflexion, pulling the foot upward.
• Downward: This would indicate plantarflexion, which is the opposite motion of what the fibularis tertius does.

Therefore, contraction of the fibularis tertius moves the foot upward.