<prompt> In which type of ptosis the amount of ptosis decreases with mouth openingBlepharophimosis syndromeMarcus gunn ptosisMyogenic ptosisNeurogenic ptosis  <response>: Marcus Gunn Jaw Ptosis congenital synkinetic ptosis In this condition there occurs retraction of the ptotic lid with jaw movements, because with stimulation of ipsilateral pterygoid muscle the levator palpebrae is also stimulated due to trigemino occulomotor synkinesis In the picture look that on opening of the jaw, ptosis has improved, this is typically marcus jaw winking phenomenon. 