I knew you'd ask, I had to look up the name of these things.
If you look under the wing you will see vortilons.
They are box shape objects tapered at the forward and trailing edge.
See the example below (this is the best picture i can find at the moment.)
example
You will notice that outboard from the engine there are serveral of these vortilons. They have the same effect as the engine pylon.
The trailing edge of these usually breaks, moving back and downwards with the flaps.
I hope this helps.