There is a set of three muscles in the central part of the brow (the procerus, with a vertical axis of contraction in the space between the brows right above the root of the nose; and the corrugators, with a diagonal axis of contraction going from the medial end of the brow towards the root of the nose) which bring the central brow down. They are overractive relative to the muscle that elevates the brow (Frontalis muscle).
An endoscopic division of these muscles only will cause a physiologic elevation of the central brow as the frontalis muscle will elevate the central brow without opposition from the procerus and glabellar muscles.
Make sure you consult with somebody who is proficient with endoscopic techniques.





