Finally, the inferior pharyngeal constrictor arises from the oblique line of the thyroid cartilage and from the side of the cricoid cartilage. Motor incoordination of the cricopharyngeus can cause difficulty swallowing. The middle pharyngeal constrictor arises from the stylohyoid ligament and the greater and lesser horns of hyoid bone and its inferior fibers lie deep to the inferior constrictor muscle. Food or other materials may reside here, which may lead to infection. A diverticulum can form where a balloon of mucosa becomes trapped outside the pharyngeal boundaries. Zenker’s diverticulum develops between the two bellies of the inferior constrictor (Thyropharyngeal and Cricopharyngeal) in a small gap called Killian’s dehiscence. Uncoordinated contraction, and/Cricopharyngeal Spasm, and/or impaired relaxation of this muscle are currently considered the main factors in the development of a Zenker’s diverticulum. Pathology Related to This Muscle: Zenker’s diverticulum During deglutition, they contract and cause peristaltic movement in the pharynx 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. 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. 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. Greater changes to swallowing kinematics and timing were observed for pudding thick consistency than thin liquid. All rights reserved.The Inferior pharyngeal constrictor, the thickest of all three constrictors, arises from the sides of the cricoid and thyroid cartilage. The inferior pharyngeal constrictor emerged with a distinctly different pattern of association with mean radiation dosage compared to other structures. ![]() It seemed to suggest a significant redundancy in growth rate of the laryngeal structures.Ībberant origin Cricothyroideus Human fetus Inferior pharyngeal constrictor Laryngeal cartilage Thyrohyoideus Upper esophageal sphincter.Ĭopyright © 2019 Elsevier GmbH. In addition, a final or adult-like morphology was found in two of the present 37 fetal specimens. Such a discrepancy in growth seems to resemble the IPC wrapping around the superior cornu of thyroid cartilage. Inferior Pharyngeal Constrictor: Attachments And Action Kenhub constrictor pharyngeal kenhub pharyngis musculus pharynx laryngopharynx. The aberrant or transient origin of the IPC seemed to result from a discrepancy in growth of the cartilage and muscles. The inferior pharyngeal constrictor continues as the esophagus (ES). ![]() Therefore, these aberrant origins were, even if developed, most likely to be "corrected" to the adult morphology during midterm or late prenatal period. The inferior pharyngeal constrictor (IC) arises from the thyroid and cartilages which are also obvious structures. ![]() These aberrant connections with nearby muscles seemed to become separated by a growing protrusion of the thyroid cartilage. In four of the latter six specimens, a tendinous band from the IPC inferior end connected to the cricothyroideus muscle to provide a digastric muscle-like appearance. These aberrant connections were most likely to be transient origins of the IPC not from a hard tissue but nearby striated muscles. In serial sagittal sections of 37 embryos and fetuses at 6-15 weeks (crown rump length 15-115mm), we found (1) the IPC connecting to the sternothyroideus and thyrohyoideus muscles (16 fetuses at 6-11 weeks) or (2) the cricothyroideus muscle (6 fetuses at 12-15 weeks) in addition to the usual cricoid origin. The inferior pharyngeal constrictor (IPC) originates from the thyroid and cricoid cartilages and inserts to the pharyngeal raphe.
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