![]() ![]() Pharyngeal plexus cricopharyngeus part can also receive innervation from the recurrent laryngeal nerve and/or the external laryngeal nerve.Īs soon as the bolus of food is received in the pharynx, the elevator muscles relax, the pharynx descends, and the constrictors contract upon the bolus and convey it down into the esophagus. Interrelationships between the innervations from the laryngeal nerves and the pharyngeal plexus to the inferior pharyngeal constrictor, Surgical and Radiologic Anatomy 10. geus, which is innervated by the glossopharyngeal nerve the innervation of the inferior pharyngeal constrictor is supplemented by the external laryngeal. The superior, middle, and inferior pharyngeal constrictors are innervated by the. The thickest of the three constrictors arises from the sides of the cricoid and thyroid cartilage.Īscending pharyngeal artery, branch of the external carotid artery. The external laryngeal nerve innervates the cricothyroid and inferior. Dose was 65 Gy to primary and nodal tumour and 54 Gy to remaining pharyngeal subsite and nodal areas at risk of microscopic disease. It is formed by the pharyngeal branches from the vagus and glossopharyngeal nerves and the cervical sympathetic 3-7. Similar to the superior and middle pharyngeal constrictor muscles, This Muscle Nerve supply is the vagus nerve (cranial nerve X), specifically, by branches from the pharyngeal plexus and by neuronal branches from the recurrent laryngeal nerve. The pharyngeal plexus sends some branches between the middle and inferior constrictors and other branches between the superior and middle constrictors 4,6. 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.The Inferior pharyngeal constrictor, the thickest of all three constrictors, arises from the sides of the cricoid and thyroid cartilage. This muscle forms the majority of the upper esophageal sphincter (UES). Its most caudal portion is commonly referred to as the cricopharyngeus (CP) muscle. and middle pharyngeal constrictor muscles to reach the oropharynx and tongue, and contributing sensory innervation to the pharyngeal plexus of nerves. 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 inferior pharyngeal constrictor (IPC) is the thickest and best developed of the three pharyngeal constrictors. 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. ![]() the CP is a particular striated muscle in function and innervation manner. 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. the canine inferior pharyngeal constrictor muscle was examined using t. 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. Fig 1 Lateral view of the deep structures of the pharynx. 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. The left vagus nerve passes inferiorly between the left common carotid and left subclavian arteries, posterior to the sternoclavicular joint, entering the thorax. Similarly to the superior and inferior pharyngeal constrictor muscles, it is innervated by a branch of the vagus nerve through the pharyngeal. Innervation: Vagus nerve (CN X) Blood Supply: Pharyngeal branch of ascending thyroid artery and branches of inferior thyroid artery. To study the functional motor nerve supply of the upper esophageal sphincter in humans. Action: Constricts the wall of the pharynx during swallowing to propel the food bolus downwards. ![]()
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