system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
the reason for the long left recurrent laryngeal Nerve is due to the persistence of which arch aery?
assistant
The correct answer is  Left RLN wind round the arch of aosta Arch of Aosta derived from left 4th Arch aery ref : VISHRAM SIGN EMBRYOLOGY