The recurrent and inferior laryngeal nerve pass deep to the lower border of the inferior constrictor. origin: it arises in the interval between the cricothyroid in front, and the articular facet for the inferior cornu of the thyroid cartilage behind.Ä«etween the thyropharyngeus and cricopharyngeus is a weak area called Killian's dehiscence which a pouch of mucosa can protrude to form a pharyngeal diverticulum. The medical definition of a dehiscence is a bursting open, splitting, or gaping along natural or sutured lines. origin: 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. a Schematic of human pharynx (posterior view), showing anatomical locations and arrangement of stylopharyngeus (SP), superior, middle, and inferior pharyngeal. The dehiscent area of muscular weakness is a triangular region formed between the two pharyngeal and oesophagal muscles, the inferior pharyngeal constrictor and the cricopharyngeus. Inferior fibers are horizontal and continuous with the circular fibers of the esophagus the rest ascend, increasing in obliquity, and overlap with the middle constrictor. It passes from the thyroid and cricoid, and the fibres spread backwards into the fibrous pharyngeal raphe. The inferior pharyngeal constrictor is a muscle of the pharynx that, together with the superior and middle pharyngeal constrictors, forms the posterior and. The Inferior pharyngeal constrictor, the most inferior of the three constrictors, that facilitate passage of the food bolus down the pharynx. It is created by the convergence of the inferior pharyngeal constrictor muscle and the cricopharyngeus muscle (Fig.
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