to snoo-finity ... and beyond!
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I believe it's that this muscle everts the foot + runs over the lateral malleolus
.. But the phrasing on the question is odd
I didn't actually know this one. I just ruled out everything except the fibularis muscles, and then to be quite honest, I think I had never heard before of the tertius one, so...I chose brevis.
@angelaq11 same here :D