Chapter 13: Ears & Nose

Ears & Nose lesson provides an in-depth exploration of the clinical assessment for the ears and nose, highlighting the anatomical structures and physiological processes vital for hearing, balance, and respiratory function. It begins by detailing the three primary sections of the ear—external, middle, and inner—and explains the dual pathways of sound transmission through air and bone conduction. The discussion clarifies how the vestibular system, including the semicircular canals and otolith organs, manages equilibrium, while the cochlea and the eighth cranial nerve facilitate the sensorineural phase of hearing. For the nasal assessment, the summary describes the supporting bone and cartilage, the vascularized mucosa of the septum, and the role of the turbinates in humidifying and cleansing air before it reaches the lungs. It also identifies the four pairs of paranasal sinuses, focusing on the frontal and maxillary sinuses which are accessible during a physical exam. In the health history section, practitioners are taught to distinguish between types of dizziness, such as true rotational vertigo, lightheadedness, and dysequilibrium, while also investigating symptoms like ringing in the ears (tinnitus), ear pain, and chronic nasal congestion. The examination techniques section offers a professional guide to performing otoscopy, visualizing the landmarks of the tympanic membrane, and conducting screening tests like the whispered voice test. Special emphasis is placed on using the Weber and Rinne tuning fork tests to pinpoint whether hearing impairment stems from conductive blockages in the outer or middle ear or sensorineural damage within the inner ear or its central connections. The nasal exam is covered through techniques for inspecting the internal cavity for deviations or polyps and palpating the sinuses for signs of bacterial infection. Finally, the chapter integrates health promotion by discussing the importance of routine hearing screenings for older adults to detect age-related hearing loss, or presbycusis, and counseling patients on the prevention of noise-induced damage, ensuring a comprehensive and holistic approach to patient care.