![]() ![]() The muscle is divided into four parts: A pterygopharyngeal, buccopharyngeal, mylopharyngeal and a glossopharyngeal part. The muscle is a quadrilateral muscle, thinner and paler than the inferior pharyngeal constrictor muscle and middle pharyngeal constrictor muscle. It is the highest located muscle of the three pharyngeal constrictors. Motor incoordination of the cricopharyngeus can cause difficulty swallowing. The superior pharyngeal constrictor muscle is a muscle in the pharynx. Uncoordinated contraction, and/or spasm and/or impaired relaxation of this muscle are currently considered the main factors in development of a Zenker's diverticulum. Superior pharyngeal constrictor (musculus constrictor pharyngis superior) Superior pharyngeal constrictor muscle is one of three pharyngeal constrictor muscles whose main function is to facilitate the process of deglutition. The inferior fibers are horizontal and continuous with the circular fibers of the esophagus the rest ascend, increasing in obliquity, and overlap the Constrictor medius.Īs soon as the bolus of food is received in the pharynx, the elevator muscles relax, the pharynx descends, and the constrictores contract upon the bolus, and convey it downward into the esophagus. 1418 More authors hypothesized that sparing a portion of the constrictor muscles (PCs), not involved by tumour and not at risk of subclinical disease, might reduce. On the thyroid cartilage it arises from the oblique line on the side of the lamina, from the surface behind this nearly as far as the posterior border and from the inferior cornu.įrom these origins the fibers spread backward and medialward to be inserted with the muscle of the opposite side into the fibrous raphé in the posterior median line of the pharynx. Open questions remain for SWOARs, especially with reference to the delineation modalities of the involved structures to the volumes or the dose constraints to be applied.From the cricoid cartilage it arises in the interval between the Cricothyreoideus in front, and the articular facet for the inferior cornu of the thyroid cartilage behind. The superior laryngeal artery passes between the middle and inferior pharyngeal constrictor muscles, and most commonly enters the larynx through the thyrohyoid. To clarify the morphologic characteristics of the superior pharyngeal constrictor muscle, which plays an important role in swallowing, the gross anatomy of.The components arising from the cricoid and thyroid cartilages are also known as cricopharyngeus and thyropharyngeus respectively. It is composed of two distinct parts, the thyropharyngeus and the cricopharyngeus muscles. ![]()
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