This document summarizes anatomy and common conditions affecting the nose. It describes the nasal anatomy including the nostrils, nasal cavity divided by the septum, and blood supply. It then discusses nasal polyps as non-cancerous growths that cause obstruction, describing their composition, causes, and surgical excision treatment. It also briefly mentions atheroma cysts occurring in horse nostrils, parasites that can infect nasal chambers, and necrosis of the turbinates from sinus pressure in horses.