Peter Attia· MD
so you have your peronal or the or the big boys on the outside so pronus brevis is going to insert on the fifth metatarsal okay powerful everter of the foot okay okay so that's going to take us from this position towards the big toe okay pronus longus also on the outside wraps underneath the foot and inserts on the medial aspect of the foot okay so down on the outside of the foot around and under to the medial to the big toe yeah so when it contracts it flattens the arch when pronus longus contracts this prates yep what he does is he's going to Evert the foot and most importantly this is why the the perenials are a very big stabilizer of your big toe which is counterintuitive because they're on the opposite side of the foot yes so when pronus longus this is the one that goes underneath the foot when he's doing his job he drop we call it dropping the head of the first metatarsal so basically what that means is it takes that bone the metatarsal and it anchors him to the floor so that we have a stable position push off yeah