What is the role of the constrictor muscles of the pharynx?
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 is the function of constrictor muscles?
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 constrictor muscles?
The superior pharyngeal constrictor muscle is a muscle in the pharynx. It is the highest located muscle of the three pharyngeal constrictors. The muscle is a quadrilateral muscle, thinner and paler than the inferior pharyngeal constrictor muscle and middle pharyngeal constrictor muscle.
What does 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 Innervates superior constrictor?
Innervation. Superior pharyngeal constrictor receives innervation from the pharyngeal branch of vagus nerve, via the pharyngeal plexus.
What structure S pass through the gap between the middle and inferior constrictor muscles?
Between the Middle and Inferior Constrictors is the third gap. The structures passing through this gap include Superior laryngeal vessels and the internal branch of the Superior Laryngeal Nerve.
What are the 4 layers of pharynx?
Microscopic Anatomy The walls of nasopharynx, oropharynx, and laryngopharynx are composed of four layers. From internal (luminal side) to external, the layers are the mucosa, submucosa, muscle layer, and fibrosa.
What is the structure of the pharynx?
pharynx, (Greek: “throat”) cone-shaped passageway leading from the oral and nasal cavities in the head to the esophagus and larynx. The pharynx chamber serves both respiratory and digestive functions. Thick fibres of muscle and connective tissue attach the pharynx to the base of the skull and surrounding structures.
What makes up the pharynx?
The pharynx is divided into three regions according to location: the nasopharynx, the oropharynx, and the laryngopharynx (hypopharynx). The nasopharynx is the portion of the pharynx that is posterior to the nasal cavity and extends inferiorly to the uvula.
What Innervates the superior pharyngeal constrictor?
Superior pharyngeal constrictor receives innervation from the pharyngeal branch of vagus nerve, via the pharyngeal plexus.
Is cricopharyngeus part of inferior constrictor?
The inferior pharyngeal constrictor muscle is one of the pharyngeal constrictor muscles. 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.
What are the 3 origin points for the superior pharyngeal constrictor?
The origins include the:
- inferior margin of the medial pterygoid plate,
- the pterygomandibular raphe,
- the medial alveolar edge of the mandible above the mylohyoid line, and.
- lateral border of the tongue (see Figure 2).
