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Across 4. pertaining to the sense of taste 5. receptor responsible for the sense of hearing and equilibrium 9. ability of the nervous system to become less responsive to a sustained stimulus 11. system of the brain that connects a smell to an emotion 12. transparent cover over the window of the eye 13. eustachian tube 15. pain that feels as if it is originating from a part other than the site being stimulated 17. outer, funnel-like structure of the ear 19. contains photoreceptors 20. organs of taste

Down 1. bipolar neurons stimulated by ordorant molecules 2. stimulated by changes in temperature 3. produces tears 6. process in which the brain projects the sensation back to its apparent source 7. lines the eyelids 8. stimulated by changes in chemical concentrations 10. adjustment of the lens of the eye for close or distant vission 14. tympanic membrane 16. the only sensation perceived from internal organ 18. photoreceptor that is functional in bright light only