<prompt> Mucoperichondrial flap in septoplasty is made onAlar cailageSeptal cailageMaxillary spineSphenoid spine  <response>: In cases of deted septum, make a slightly curvilinear incision, 2-3 mm above the caudal end of septal cailage on the concave side Killians incision. In case of caudal dislocation, a transfixion or hemitransfixion Freers incision is made. The latter is septocolumellar incision between caudal end of septal cailage and columella. Raise mucoperichondrial or mucoperiosteal flap on one side only. Separate septal cailage from the vomer and ethmoid plate and raise mucoperiosteal flap on the opposite side of septum. Ref: Dhingra 7e pg 473. 