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Right recurrent laryngeal nerve vs Left recurrent laryngeal nerve

Asked by Jayrani 

Both the recurrent laryngeal nerves originate from the Vagus nerve (Cranial nerve X). It descends down and hooks on:

1. Aortic arch: Left recurrent laryngeal nerve
2. Right subclavian artery: Right recurrent laryngeal nerve

Both of them ascend in tracheo-esophageal groove and enters the larynx posterior to the cricothyroid joint. The nerve is now called inferior laryngeal nerve. It supplies laryngeal mucosa below the fissure of glottis.

Remember the mnemonic: SCAR

Superior laryngeal nerve supplies Cricothyroid. All other laryngeal muscles are supplied by Recurrent laryngeal nerve.