I. Olfaction – the sense of smell
            A. Olfactory Receptors
                        1. Odorants
                        2. Odorant binding proteins
            B. Olfactory Pathways

 
II. Gustation – the sense of taste
            A. Lingual papillae
                        1. Filiform papillae
                        2. Fungiform papillae
                        3. Vallate papillae
            B. Taste buds
                        1. Gustatory Cells
                        2. Support cells
                        3. Basal cells
            C. Gustatory pathways

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