![]() they innervate its muscles, as the inferior constrictor of the pharynx. It is the highest positioned muscle among the three pharyngeal constrictors. Furthermore, this study shows that intraoperative electromyography in humans is a feasible method to analyze the physiology of the motor innervation of the upper esophageal sphincter. 5: Anterior view of the neck in different planes, from surface to depth (Figs. Innervation The superior pharyngeal constrictor muscle is a muscle in the pharynx. This is the first report which provides evidence that the recurrent laryngeal nerve functionally contributes to the motor innervation of the cricopharyngeal and inferior pharyngeal constrictor muscle. The pharyngeal plexus functionally contributes to the motor innervation of the inferior pharyngeal constrictor muscle but does not always contribute to the motor innervation of the cricopharyngeal muscle. Neuromuscular compartments and fiber-type regionalization in the human inferior pharyngeal constrictor muscle. pierces the inferior pharyngeal constrictor muscle at the level of the inferior thyroid tubercle to enter the cricothyroid muscle. descends posterior to the superior thyroid artery. cricothyroid arch INSERTION Cricopharyngeus: continuous with muscle of opposite side, Thyropharyngeus : lower pharyngeal raphe ACTION Aids swallowing. origin: arises as the smaller of the two branches of the superior laryngeal nerve at the level of the greater cornu of the hyoid bone. This muscle forms the majority of the upper esophageal sphincter (UES). INFERIOR CONSTRICTOR ORIGIN Cricopharyngeus: lateral aspect of arch of cricoid cartilage. Its most caudal portion is commonly referred to as the cricopharyngeus (CP) muscle. V2 innervation of the upper teeth, maxillary sinuses, and palate is via the anterior, middle, and posterior superior alveolar nerves, respectively. The inferior pharyngeal constrictor (IPC) is the thickest and best developed of the three pharyngeal constrictors. The left vagus nerve passes inferiorly between the left common carotid and left subclavian arteries, posterior to the sternoclavicular joint, entering the thorax. These muscles constrict the walls of the pharynx during swallowing. ![]() cricothyroid muscle and lower portion of inferior pharyngeal constrictor. The pharyngeal branch of the vagus innervates the superior, middle, and inferior pharyngeal constrictors. The recurrent laryngeal nerve functionally contributes to the motor innervation of the cricopharyngeal muscle in all patients and contributes to the motor innervation of the inferior pharyngeal constrictor muscle in most patients. External branch of superior thyroid nerve innervates What artery does it run with. The contribution of the recurrent laryngeal nerve and the pharyngeal plexus in the motor nerve innervation of the cricopharyngeal muscle and the inferior pharyngeal constrictor muscle was examined intraoperatively.Įlectromyography showed that there is a considerable overlap in the innervation of the cricopharyngeal muscle and the inferior pharyngeal constrictor muscle. The recurrent laryngeal nerve (RLN), also known as the inferior laryngeal nerve, is a branch of the vagus nerve (CN X) which has a characteristic loop around the right subclavian artery on the right and the aortic arch on the left before returning up to ascend the tracheoesophageal groove and then the larynx.To study the functional motor nerve supply of the upper esophageal sphincter in humans. ![]()
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