Uludag M, et al. – The researchers aimed to determine whether the external branch of the superior laryngeal nerve (SLN) contributes to the motor innervation of the posterior cricoarytenoid muscle. They disclosed that in one–third of the cases, the external branch of the SLN contributes to the ipsilateral posterior cricoarytenoid muscle innervation. This contribution was usually unilateral, however, occasionally it could be bilateral.