*Kiesselbach's plexus: Antero superior pa is supplied by ANTERIOR & POSTERIOR ETHMOIDAL AERIES which are branches of ophthalmic aery, branch of INTERNAL CAROTID AERY. Antero inferior pa is supplied by SUPERIOR LABIAL AERY - branch of facial aery, which is branch of EXTERNAL CAROTID AERY. Postero superior pa is supplied by SPHENO-PALATINE AERY - branch of MAXILLARY aery, which is branch of ECA. POSTERO INFERIOR pa is supplied by branches of GREATER PALATINE AERY - branch of ECA Antero inferior pa/vestibule of septum contain anastomosis b/w septal ramus of superior labial branch of facial aery & branches of sphenopalatine, greater palatine & anterior ethmoidal aeries. These form a large capillary network called KIESSELBACH'S PLEXUS If dryness persists, bleeding will occur Therefore, in given options, Anterior ethmoidal aery is a branch of ICA not ECA