Following muscles of larynx are supplied by recurrent laryngeal nerve EXCEPT:
Ans. a (Cricothyroid) (Ref. ENT by PL Dhingra, 3rd ed., 359)# All muscles that move the vocal cord (tensors, abductors and adductors) are supplied by recurrent laryngeal nerve except the cricothyroid muscle, which is supplied by external laryngeal, a branch of superior laryngeal nerve of vagus.# Recurrent laryngeal nerve enters inferiorly & laterally to cricothyroid articulation via KILLIAN-JAMIESON area.# It on the left side originates over the aortic and ascends in the neck to innervate the larynx.# On the right, it goes around the subclavian artery.# Lesions involving both superior and recurrent laryngeal nerves are expected to produce lateral (intermediate/ cadaveric) position. while isolated recurrent nerve palsy results in paramedian cord positions.Educational points:PALATE# All of the muscles of the palate, except for the tensor veli palatini, are innervated by the vagus nerve. The tensor veli palatini is innervated by the maxillary division of the trigeminal nerve.PHARYNX# All the muscles of the pharynx, except for the stylopharyngeus, are innervated by the vagus nerve. The stylopharyngeus muscle is innervated by the glossopharyngeal nerve.LARYNX# All the muscles of the larynx, except for the cricothyroid muscle, are innervated by the recurrent laryngeal branch of the vagus nerve. The cricothyroid muscle is innervated by the external laryngeal branch of vagus.
Cricothyroid
Lateral cricoarytenoid
Posterior cricoarytenoid
Thyroarytenoid
Larynx