<prompt> If posterior epistaxis cannot be controlled,which aery is kigatedposterior Ethmoidal aeryMaxillary aerySphenopalatine aeryExternal carotid aery  <response>: ESPAL is the current ligation of choice controlling bleeding in over 90 of cases with a low complication rate. Sphenopalatine aery is ligated in the sphenopalatine foramen. Ref Scott Brown 7e,Vol 2,p 1606. 