![]() ![]() Motility disorders can result from many neuromuscular conditions affecting any level of the neural system: cortex brainstem, cerebellum, basal ganglia, cranial nerves, peripheral nerves, myoneuronal junction, and even the muscles of deglutition themselves. This review focuses on normal and abnormal motility of the organs involved in the oral and pharyngeal phases of deglutition, but does not discuss the structural causes of dysphagia or esophageal motility. The musculature of the pharynx consists of three overlapping constrictors (superior, middle and inferior) externally, with three smaller internal muscles.Dysphagia can result from many diverse conditions, including structural and motility disorders. ![]() These muscles make up the inner layer of musculature - they act to elevate (shorten and widen) the pharynx and larynx during swallowing and speaking. pronounced paresis of the pharyngeal constrictor muscle. The stylopharyngeus muscle is supplied by the glossopharyngeal nerve (CN IX). The three pharyngeal constrictor muscles make up the outer layer of the wall while the inner layer is comprised of paired muscles. The inferior pharyngeal constrictor (IC) arises from the thyroid and cartilages which are also obvious structures. The paresis included all three portions of the muscle in six patients. The inferior pharyngeal constrictor continues as the esophagus (ES). There are three circular pharyngeal constrictor muscles the superior, middle, and inferior pharyngeal constrictors. The constrictors join in the mid line posteriorly as a seam (pharyngeal raphe) which is suspended form the pharyngeal tubercle on bottom of the occipital bone. They are stacked like glasses, which form. superior pharyngeal constrictor muscle noun: superior constrictor. All other muscles are supplied by the vagus nerve (CN X). See Definitions and Examples ยป Get Word of the Day daily email Test Your Vocabulary. The blood supply for the muscles is provided by the external carotid artery. The main branches include the ascending pharyngeal artery, facial artery, lingual artery, and maxillary artery.( anatomy) The quadrilateral muscle in the pharynx, located superior to other pharyngeal constrictor muscles, arises from the pterygomandibular raphe, and inserts into the median raphe The stylopharyngeus muscle also extends between the superior and middle pharyngeal constrictors and can be used to separate these two muscles. The superior pharyngeal constrictor is one of the three constrictor muscles of the pharynx. The other pharyngeal constrictors are the middle pharyngeal constrictor and the inferior pharyngeal constrictor. Morphoanatomically, the superior pharyngeal constrictor is relatively thin and pale. It is located above the other two pharyngeal constrictors, forming a tube beginning at the pterygomandibular raphe. The superior pharyngeal constrictor is composed of four parts according to origin (pterygomandibular raphe), i.e. the pterygopharyngeal part, the buccopharyngeal part, the myolopharyngeal part, and the glossopharyngeal part. Inferior Constrictor Muscle At the level of the laryngopharynx Origin: sides of thyroid and cricoid cartilages and arch of cricoid cartilage Fibers run around to form a semi-circle Insertion: dorsal pharyngeal midline raphe Function: Innervation: CN X and CN XI Narrow pharynx From: Warfel (1978), p. 2 It is inserted into the median raphe of pharyngeal aponeurosis. It is innervated by the IX accessory nerve and X vagus via the pharengeal plexus. ![]() Its function is to pull the pharyngeal wall forward and to constrict the pharyngeal diameter. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |