The structures labeled The structures labeled on the left are to be on the right are to be associated with inspiration respiratory associated with expiration center Respiratory center motor Centrally acting pathways vagus nerve antitussives sensory pathway phrenic nerve external ptors intercostal of alveoli muscles Sensory nerves intercostal nerve lly acting Peripherally antitussives Motor nerves diaphragMotor nerves Centrally acting antitussives Peripherally acting antitussives