Relationship between the Recurrent Laryngeal Nerve and the Inferior Thyroid Artery: A Study In Fetal Corpses.

The recurrent laryngeal nerve route is determined by the development and movements of arteries from which ones it is related, and the variations of these structures will set differences in the anatomical disposal of this nerve. After the arterial relation of the recurrent laryngeal nerve near its origin, rises in the neck to reach the intertracheoesofagic space. During this rising road, the recurrent laryngeal nerve crosses to the inferior tiroid artery axially. This works objective is to study on fetus, by means of dissections of the infrahiod area, the conection that the recurrent nerve has with the inferior tiroid artery and analizing some details that can affect this relation.Working with 47 fetus from between 4 and 8 months of gestational age, all preserved with formol to 10 %. We classified the relationship about the position of the inferior laryngeal nerve depending his position regarding to the inferior tiroid artery in: previous position, subsequent and intermediate. Mostly was found the laryngeal recurrent nerve in front of the artery, previous position 48% from the right side and 59 % from the left one. The subsequent position was the second one in order to the frequency in the right side with 30% and in the left at 30% too.