en Original Original <p dir="ltr" style="text-align: justify;">During the past few years, researchers and practitioners have developed novel techniques,&nbsp;using ansa cervicalis to innervate muscles of the larynx paralyzed due to surgical procedures&nbsp;carried out in the chest and neck areas. During routine dissection of a middle-age male cadaver,&nbsp;an unusual course of the superior root of the ansa cervicalis was observed. In this case, the&nbsp;superior root of the ansa cervicalis fused with the vagus and ran within the carotid sheath,&nbsp;and then joined the inferior root forming the ansa cervicalis in the anterior wall of the carotid&nbsp;sheath. The study of this case will add to our current knowledge of ansa cervicalis and thus aid&nbsp;prevention of injury to the nerve during various surgical procedures.</p> Cervical plexus, Variation, Vagus nerve, Nerve loop 199 202 http://anatomyjournal.ir/browse.php?a_code=A-10-87-4&slc_lang=en&sid=1 Mohsen Noorozian 10031947532846001316 10031947532846001316 No Department of Biology and Anatomical Sciences, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Mohammad Bayat 10031947532846001317 10031947532846001317 No Department of Biology and Anatomical Sciences, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Reza Mastery Farahani 10031947532846001318 10031947532846001318 No Department of Biology and Anatomical Sciences, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Mohammad-Amin Abdollahifar 10031947532846001319 10031947532846001319 No Department of Biology and Anatomical Sciences, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Hadi Azimi 10031947532846001320 10031947532846001320 No Department of English Language Teaching, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Ali Noori-Zadeh 10031947532846001321 10031947532846001321 No Department of Medical Sciences, Shahrood Branch, Islamic Azad University, Shahrood, Iran. Azam Asemi Rad 10031947532846001322 10031947532846001322 No Department of Biology and Anatomical Sciences, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Somayeh Fallah Nejhad 10031947532846001323 10031947532846001323 No Department of Biology and Anatomical Sciences, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Maryam Salimi 10031947532846001324 10031947532846001324 No Department of Biology and Anatomical Sciences, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Hojjat-Allah Abbaszadeh hoomanabs@gmail.com 10031947532846001325 10031947532846001325 Yes Department of Biology and Anatomical Sciences, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.