Anatomy of recurrent laryngeal nerveAnatomy of recurrent laryngeal nerveAnatomy of recurrent laryngeal

Download Anatomy of recurrent laryngeal nerveAnatomy of recurrent laryngeal nerveAnatomy of recurrent laryngeal

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<p>PowerPoint Presentation</p> <p>Anatomy of recurrent laryngealnerve (RLN)DENT113PBL 3.4 Complicated thyroidectomy Supervision :Prof.Hanaa GazaerlyBy Ebtisam Ali</p> <p>RECURRENT LARYNGEAL NERVEThe recurrent laryngeal nerve is amyelinated nerve.It is a branch of thevagus nerve(cranial nerve X).It's supply thesixth pharyngeal arche.The Branches provide bothsensoryandmotorfibers.</p> <p>There are two recurrent laryngeal nervesrightandleftin the human body both arising from the vagus nerve but they follow slightly different courses on the left and right side.</p> <p>The right recurrent laryngeal nerveOriginates from thedescending right vagusnerve as it passes intermediate to theright subclavian veinanteriorly and theright subclavian arteryposteriorly.It curvesposteriorlyaround the inferior margin of theright subclavian artery.Then, it passesmediallyand ascends over the posterolateral surface of the trachea into the groove between esophagus and trachea.</p> <p>The left recurrent laryngeal nerveOriginates from theleft vagus nerveas it passes overthe arch of the aorta inferior to the left superior intercostal vein.It passesmediallyandposteriorlydeep to theligamentum arteriosumbefore curving inferior to the arch of the aorta.It then passessuperiorlyover the left main bronchus to ascend in the groove between the left side of the trachea and the anterior of the esophagus.</p> <p>Initially these nerves, branches of the vagus, supply the sixth pharyngeal arches. When the heart descends, they hook around the sixth aortic arches and ascend again to the larynx, which accounts for their recurrent course.</p> <p>On the right, when the distal part of the sixth aortic arch and the fifth aortic arch disappear, the recurrent laryngeal nerve moves up and hooks around the rightsubclavian artery.On the left the nervedoes not move up, since the distal part of the sixth aortic arch persists as theductus arteriosus,which later forms theligamentum arteriosum.</p> <p>The left RLN is longer than the rightBecause it crosses under the arch of the aorta at the ligamentum arteriosum</p> <p>Considering the extra length and the distance the left recurrent laryngeal nerve has to travel, it is the common nerve affected by diseases / disorders / trauma etc.</p> <p>Functions of RLNIt hasmotor control of all the intrinsic muscles of the larynx, the thyroarytenoid, the posterior and lateral cricoarytenoid, and arytenoid muscles depends upon the recurrent laryngeal nerveIttransmits sensory informationfrom the mucous membranes of the larynx from the lower surface of the vocal fold, downwards.</p> <p>ReferencesSunderland S, Swaney WE. The intraneural topography of the recurrent laryngeal nerve in man.Anat Rec. Nov 1952;114(3):411-26Moore, Keith L (1992),Clinically Oriented Anatomy(3rd ed.)F. Charles Brunicardi; F. Brunicardi; Dana Andersen; E. Pollock Raphael, Timothy Billiar, David Dunn, John Hunter, Jeffrey Matthews, Raphael E. Pollock (September 11, 2009).Schwartz's Principles of Surgery(9th ed.). McGraw Hill Professional. pp.13461347. ISBN978-0-07-154769-7.Grey's Anatomy ,Henry Gray ,40th Ed.Textbook of laryngology Edited by : Albert L. Merati,MD,Steven A . Bielamowicz,MD ,FACS ( 2006 )</p>

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