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Sensory neurons innervating the lower airway provide essential feedback information that regulates respiratory physiology. These neurons synapse with second-order neurons in the central nervous system, which project directly or indirectly to the respiratory and autonomic centers. Both primary sensory neurons and second-order neurons within these circuits exhibit significant heterogeneity, and the precise roles of individual neuronal subtypes in coding the airway's internal states and modulating respiratory and autonomic outputs remain incompletely understood. In this review, we summarize recent advances in understanding the neuronal diversity along sensory circuits of the lower airway and their physiological functions. We also highlight the challenges in elucidating the roles of specific neuronal subtypes due to the extensive molecular and anatomical diversity among these neurons. Improving targeting specificity for neuronal manipulation, combined with the development of a comprehensive connectivity map, will be critical for revealing the coding and wiring logics that underlie the precise control of respiratory physiology.
