Study On Applied Anatomy Of Recurrent Laryngeal Nerve And It's Branches

Objective: we can provide the morphology and anatomia topographica bases in order to locate and protect laryngeal nerve in the Operation of neck。Method: Dissecting 30 cervical part of corpses, then, locating and observing laryngeal nerve and its branch through fineness dissecting。Then deal the measured data with statistics soft ware。Results: 1,The average TD of laryngeal nerve is (1.92+-0.35) mm. (2) Laryngeal nerve lines on trachea esophagus groove, but, a few part goes into the groove obliquely, especially the right side。(3) 87 percent of laryngeal nerve branches like twig, called twig type. 13 percent laryngeal nerve branches anastomose or branches and adrenergic nerve anastomose with each other., called laryngeal nerve loop. (4) Laryngeal nerve have 2-5 branches, 3-4 branches account 71.7percent. (5) 93.3 percent larynx branches of laryngeal nerve separate into ahead and posterior branches, (16.5+-7.2)mm far away from cornu inferius cartilaginis thyroideae. Larynx extermal branch lines 10.5-70.2mm far from it. Laryngeal nerve ahead branch and posterior branch afferens into larynx from cornu inferius cartilaginis thyroideae. (6) 61.7percent of erupt position of laryngeal nerve branches are above glandula thyreoidea anus perineum plane., (10.2+-7.1)mm far from glandula thyreoidea anus perineum. 4percent erupt position of branches are at the same hight of glandula thyreoidea anus perineum. 31.7 percent are blow the plane , (8.5+-5.6)mm far from it. (7) The number of Laryngeal nerve which mostly locate post glandula thyreoidea infer-arteries bole is large, account 46.7 percent. The number of nerve which locate before artery and between artery branches is close to each other. But, the left and right is obviously different, the number witch left nerve locates post of artery is large, while, the right nerve locate before the artery is normally.Conclusion: 1, The reason of damaging the laryngeal nerve is usually the insufficient cognition of laryngeal nerve. So, we should know well the normal morphous,courser,neighbour relationship of laryngeal nerve. The TD of laryngeal nerve and the TD in tracheo-asophageal groove is helpful in the operation to identify the bole, while, understand the appearance ,courser, and the number of laryngeal nerve branches is helpful to distinguish the bole and the branch .At the mean while, we should the variation of laryngeal nerve and its branches。2,The display of variation usually is the variation of appearance and branches。Especially,the variation of branches is more complicated。laryngeal nerve injury may happen to one side of laryngeal nerve bole or one of the branches,and,cause hoarse voice。So,we should protect both the bole and the branches。3,In the operation of neck,arteria thyreoidea inferior and cornu inferius cartilaginis thyroideae is the marker to identify the laryngeal nerve。But,my investigation display:though these two methods are ok,but,there is some indeterminateness。So,0n the base of understanding the laryngeal nerve and its branches variation well , we should strengthen containment awareness,operate safely,in order to cut down the percent of injury of laryngeal nerve and raise the quality of neck surgical operation。...