What are the pharyngeal constrictor muscles?
What are the pharyngeal constrictor muscles?
The superior pharyngeal constrictor muscle is one of the pharyngeal constrictor muscles. Its primary action is constriction of the pharynx (in coordination with the middle pharyngeal constrictor and the inferior pharyngeal constrictor muscles) to deliver a bolus of food into the esophagus.
What is the role of the constrictor muscles of the pharynx?
By sequential contraction, the pharyngeal constrictor muscles create a peristaltic wave that facilitates passage of the food bolus inferiorly, from the pharynx towards the esophagus, during the act of deglutition.
What does the inferior constrictor muscle do?
The function of this muscle is to facilitate food propagation towards the esophagus by constricting the wall of pharynx during deglutition. In addition, the inferior part of this muscle forms the upper esophageal sphincter.
What is the inferior constrictor?
Medical Definition of inferior constrictor : a muscle of the pharynx that is the thickest of its three constrictors, arises from the surface and side of the cricoid and thyroid cartilages, inserts into the median line at the back of the pharynx, and acts to constrict part of the pharynx in swallowing.
Where is the constrictor muscle?
pharynx
The superior pharyngeal constrictor muscle is a muscle in the pharynx. It is the highest located muscle of the three pharyngeal constrictors.
What are the 3 divisions of the pharynx?
Inferiorly, it opens into the larynx and esophagus. The pharynx is divided into three regions according to location: the nasopharynx, the oropharynx, and the laryngopharynx (hypopharynx).
What Innervates the middle pharyngeal constrictor?
Similarly to the superior and inferior pharyngeal constrictor muscles, the middle pharyngeal constrictor is innervated by a branch of the vagus nerve through the pharyngeal plexus.
What Innervates superior pharyngeal constrictor?
The superior pharyngeal constrictor muscle is innervated by the pharyngeal branch of the vagus nerve via the pharyngeal plexus.
What nerve Innervates the middle pharyngeal constrictor?
What is Thyropharyngeus muscle?
The thyropharyngeus muscle originates from the thyroid cartilage and inserts into the median pharyngeal raphe. The cricopharyngeus muscle originates from the cricoid cartilage and blends into the esophageal muscle. When the inferior constrictors contract, they constrict the lower portion of the pharynx.
Are pharyngeal constrictors voluntary?
The pharyngeal muscles (involuntary skeletal) push food into the esophagus. There are two muscular layers of the pharynx: the outer circular layer and the inner longitudinal layer. The outer circular layer includes: Inferior constrictor muscle.
What Innervates the middle constrictor muscle?
