chapter  56
Chronic aspiration
ByGuri S. Sandhu, Khalid Ghufoor
Pages 12

INTRODUCTION The larynx, trachea and bronchi form the conduit between the lungs and the external environment through which respiratory gases are transported and pulmonary secretions are expectorated. The larynx is also the primary organ of phonation, acts to protect the airway from aspiration during swallowing and provides important sensory feedback and movements that are critical to the control of ventilation.1 Swallowing is a highly complex process, both voluntary and involuntary, requiring the precise coordination of many different muscle groups through the actions of sensory and motor nerves via the central nervous system.