<prompt> In case of uncontrolled epistaxis ligation of internal maxillary artery is to be done in the:Maxillary antrumPterygopalatine fossaIn the neckMedial wall of orbit  <response>: b Pterygopalatine fossaRef. Scott Brown, 8th ed., Vol 1; 1178The maxillary artery which is also called internal maxillary artery along with sphenopalatine and greater palatine artery lies in the sphenopalatine pterygopalatine fossa just behind the posterior wall of maxillary antrum.In uncontrolled epistaxis ligation of internal maxillary artery is to be done in the sphenopalatine fossa via Caldwell-Luc operation. 