What is middle pharyngeal constrictor?
What is middle pharyngeal constrictor?
The middle pharyngeal constrictor muscle is one of the pharyngeal constrictor muscles. Its primary action is constricting of the pharynx (in coordination with the superior pharyngeal constrictor and the inferior pharyngeal constrictor muscles) to deliver a bolus of food into the esophagus.
What are the constrictor muscles of the pharynx?
The three pharyngeal constrictor muscles make up the outer layer of the wall while the inner layer is comprised of paired muscles. The superior, middle and inferior pharyngeal constrictor muscles form a muscular sleeve that has a strong internal lining on its fascial aspect known as the pharyngobasilar fascia.
What separates the pharynx from the larynx?
The pharynx is a space that connects the mouth with the esophagus, and the nasal cavity with the larynx. The soft palate divides the pharynx into the nasopharynx dorsally and the oropharynx ventrally. The oropharynx is divided into the isthmus of fauces (throat opening) and a laryngeal part.
What is the function of the pharyngeal constrictor muscles?
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 is the middle constrictor muscle?
The middle pharyngeal constrictor is a fan-shaped muscle located in the neck. It is one of three pharyngeal constrictors. 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 passes between the superior and middle constrictor muscles?
The posterior border of this confluence is the glossopharyngeal gap, where the styloglossus and stylohyoid muscles pass between the superior and middle pharyngeal constrictor muscles, as they extend from the styloid process in the lateral pharyngeal space to the tongue and hyoid bone.
What are 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.
Where is the constrictor muscle?
The superior pharyngeal constrictor muscle is a muscle in the pharynx. It is the highest located muscle of the three pharyngeal constrictors.
What is the difference between larynx and pharynx?
The main difference between pharynx and larynx is that pharynx is a part of an alimentary canal, which extends from the nasal cavity and mouth to the larynx and the esophagus whereas larynx is the upper portion of the trachea. The larynx is also called the vocal box since it contains vocal cords.
Whats the difference between the pharynx and larynx?
Pharynx — is the muscle-lined space that connects the nose and mouth to the larynx and esophagus (eating tube). Larynx — also known as the voice box, the larynx is a cylindrical grouping of cartilages, muscles and soft tissue that contains the vocal cords.
What is passing between the middle and inferior constrictor?
The superior laryngeal artery passes between the middle and inferior pharyngeal constrictor muscles, and most commonly enters the larynx through the thyrohyoid membrane; however, it may pass through an opening in the thyroid lamina in patients with absent superior cornu and may rarely enter through the cricothyroid …
What is the origin of middle pharyngeal constrictor?
|Middle pharyngeal constrictor muscle|
|Artery||Ascending pharyngeal artery|
|Nerve||Pharyngeal plexus of vagus nerve|
Where does the middle pharyngeal constrictor meet the larynx?
The pharyngeal constrictor muscles encircle the pharynx and larynx. They run from an anterior origin to meet posteriorly in the midsagittal plane, forming a semi-circular tube. The middle pharyngeal constrictor is a fan-shaped muscle that has two points of origin.
What are the names of the muscles in the pharynx?
These muscles are known as the stylopharyngeus, the palatopharyngeus and the salpingopharyngeus. Overview of the pharyngeal muscles – posterior view. There are several gaps that exist between the folds of the pharyngeal constrictor muscles which allow structures to enter and exit the pharynx.
Where do the motor fibers of the pharyngeal constrictor come from?
All three pharyngeal constrictors receive their innervation from the pharyngeal plexus. The motor fibers of this plexus are derived from the pharyngeal branch of the vagus nerve (CN X), while sensory fibers arise from the glossopharyngeal nerve (CN IX).
Where does the inferior pharyngeal constrictor join the esophagus?
The inferior pharyngeal constrictor continues as the esophagus (ES). 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. We will cover the nerve supply of the pharynx later.