The recurrent laryngeal nerve supplies motor input to all of the intrinsic muscles of the larynx, except for the CT. This nerve also supplies sensory innervation to the glottis, subglottis, proximal trachea and esophagus. Other branches from RLN contribute to the motor function of the cricopharyngeus muscle, and supply parasympathetics to the cardiac and esophageal plexus and to the larynx. The nerve's course has been extensively studied and follows some general rules; however, upon close inspection, the details of the course of this nerve are quite varied and rarely abide by anatomical criteria which can safely be applied in all cases.
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