![]() ![]() Severe spasm can cause pain during swallowing( Odynophagia). Motor incoordination of the cricopharyngeus can cause difficulty swallowing. The action of the dorsal pharyngeal constricting muscles and the stylopharyngeus muscle is responsible for stiffening and dilating the nasopharynx. the pharyngeal raphe, and the superior, middle and inferior pharyngeal constrictor muscles, the thyropharyngeus muscle and the cricopharyngeus muscle. 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. Ducharme, in Equine Exercise Physiology, 2008 Dorsal pharyngeal constrictors. 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. 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. ![]() The Zenker diverticulum occurs at an area of potential weakness in the inferior pharyngeal constrictor muscle referred to as the Killian dehiscence. 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. Zenkers diverticulum is a pseudodiverticulum consisting of mucosa and submucosa that arise from the posterior portion of the inferior pharyngeal constrictor muscle.The muscle is described as having two main parts, thyropharyngeus and cricopharyngeus, which originate from the oblique line of the thyroid lamina and lateral aspect of the cricoid cartilage respectively. The components arising from the cricoid and thyroid cartilages are also known as cricopharyngeus and thyropharyngeus respectively. The inferior pharyngeal constrictor muscle is one of the pharyngeal constrictor muscles. ![]()
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