the reason for the long left recurrent laryngeal Nerve is due to the persistence of which arch aery?: (A) 3rd Arch, (B) 5th Arch, (C) 4th Arch, (D) 2nd Arch
Answer is C. Left RLN wind round the arch of aosta Arch of Aosta derived from left 4th Arch aery ref : VISHRAM SIGN EMBRYOLOGY