<prompt> Source of epistaxis after ligation of external carotid aery is:Maxillary aeryGreater palatine aerySuperior labial aeryEthmoidal aery  <response>: A, B and C are branches of external carotid aery. If external carotid aery is ligated,the source of epistaxis will be Ethmoidal aery which is a branch of internal carotid aery. Ref Dhingra 6e,p 178. 