Ans. D. anterior ethmoidalThe nasal septum also derives its blood supply from :Branches from the external carotid aery are the sphenopalatine aery, the greater palatine aery, the superior labial aery, and the angular aery.The main branches from the interior carotid are the anterior ethmoidal aery, and the posterior ethmoidal aery that supplies the septum, and these derive from the ophthalmic aery.