There are filaments of PCA muscle arranged obliquely to the main branch, forming "aqueduct", under wich passes the RLN. Results: There are morfological diferences in the RLN's branches that reach the PCA and PCL muscles, observing the unipedicular, bipedicular and tripedicular inervations. ![]() Material and Method: It was realized bilateral dissections, on the surgical microscope, in 20 adult's larynxes, from both Sex, referring to posterior and posterolateral regions of the larynx. ![]() Facing this, the aim of the current study is the elaborated investigation about the recurring laringeal nerve (RLN) branches, directed to posterior (PCA) and lateral (PCL) cricoarytenoid muscles. The plentiful variation, the important surgical appliance and even the dificulties in the functional corroboration of the nervous branchs to the larynx make this subject intriguing and challenging. The complexity of the laringeal inervation has motivated the appearing of a large number of researches, specially that ones related to the recurrent laringeal nerve (RLN). Keywords: larynx, innervation, intrinsic musculature, recurrent laryngeal nerve ![]() Contribution to the anatomic study of the innervation of the posterior and lateral crico-arytenoid muscles
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