A 58-year-old female, known case of multinodular goiter underwent sub-total thyroidectomy. After 8 days, patient again presented to the OPD with hoarseness of voice. The nerve which was damaged during the surgery supplies all the muscles marked except: -: (A) MUSCLE B, (B) MUSCLE A, (C) MUSCLE D, (D) MUSCLE C
Answer is B. THIS IS A CLASSICAL CASE OF RECURRENT LARYNGEAL NERVE (RLN) PALSY POST THYROIDECTOMY. RLN SUPPLIES ALL THE MUSCLES OF LARYNX EXCEPT CRICOTHYROID WHICH IS SUPPLIED BY EXTERNAL LARYNGEAL NERVE.