Inferior pharyngeal constrictor9/14/2023 ![]() The communication between these nerves may. Radiology 1988 167:319–326, with permission from the Radiological Society of North America. The inferior constrictor is innervated by the pharyngeal plexus and the external and recurrent laryngeal nerves. Examination of the patient with dysphagia. There is more symmetric distention proximally than distally because the superior portion lacks the support of the thyroid cartilage. d: The patient demonstrates "blowing up a balloon." The pharynx is now expanded especially in the region of the proximal portions of the piriform sinus. 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. In this patient the epiglottis is not clearly visualized on this view at rest. The inferior pharyngeal constrictor muscle is one of the pharyngeal constrictor muscles. (a, b: Source: Netter images, with permission from Elsevier Science.) c: The pharynx has now been coated with high-density barium outlining the valleculae (v) and piriform sinuses (p). This drawing shows the contours of the valleculae and piriform sinuses and demonstrates the relationship of the valleculae to the base of the tongue and epiglottis. Note the uvula, epiglottis, piriform sinus and tongue. It is a submucosal plane, located between the mucosa and muscularis layers. The pharyngobasilar fascia lies between the levator and tensor veli palatini muscles 7. Inferior constrictor overlaps the middle constrictor. inferiorly: superior pharyngeal constrictor muscle anteriorly: posterior border of medial pterygoid plate posteriorly: midline pharyngeal raphe Relations and/or Boundaries. b: The structures in the anterior wall of the pharynx as viewed from the posterior aspect. Into the median fibrous raphe on the posterior aspect of pharynx. Note also that the fibers of the cricopharyngeus or horizontal fibers of the inferior constrictor muscle merge with the fascicles of the proximal circular muscle of the esophagus. Note again that the constrictor muscles overlap, the inferior being the more external and the superior the more internal. Their different attachment points and sequential, involuntary contraction allow the pharyngeal lumen to be closed in a cranial to a caudal direction for peristalsis during swallowing, while alternately remaining. A: The constrictor and lateral suspensory muscles of the pharynx viewed from the posterior aspect, showing: the pharyngeal raphe, and the superior, middle and inferior pharyngeal constrictor muscles, the thyropharyngeus muscle and the cricopharyngeus muscle. The three pharyngeal constrictor muscles are delineated by their position relative to one another (superior, middle, and inferior). ![]()
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |