What is the action of 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 causes pharyngeal constriction?
Primarily produced by sequential constrictor contraction, it impels bolus through the pharynx and pharyngoesophageal inlet in combination with negative pressures generated within the oesophagus and hyolaryngeal distraction.
What is pharyngeal plexus?
The pharyngeal plexus lies on the posterolateral wall of the pharynx, mainly over the middle pharyngeal constrictor and is the main motor and sensory nerve supply to the muscles of the pharynx and soft palate and acts to coordinate swallowing and speech 1-7.
What supplies pharyngeal constrictors?
During swallowing, these muscles act to shorten and widen the pharynx. They are innervated by the pharyngeal branch of the vagus nerve (CN X) with the exception of the stylopharyngeus muscle which is innervated by the glossopharyngeal nerve (CN IX)….
| Pharyngeal muscles | |
|---|---|
| TA2 | 2176 |
| FMA | 67169 |
| Anatomical terms of muscle |
What do the pharyngeal muscles do?
Anatomical terms of muscle The pharyngeal muscles are a group of muscles that form the pharynx, which is posterior to the oral cavity, determining the shape of its lumen, and affecting its sound properties as the primary resonating cavity. The pharyngeal muscles (involuntary skeletal) push food into the esophagus.
Where do pharyngeal constrictors attach?
The middle pharyngeal constrictor muscle proximally attaches to the stylohyoid ligament and the greater and lesser cornu of the hyoid bone. It distally attaches to the median pharyngeal raphe, as does the inferior pharyngeal constrictor muscle. It constricts the middle portion of the pharynx.
Does the pharyngeal superior constrictor muscle contour on computed tomography?
Irradiation of the Pharyngeal Superior Constrictor Muscle (PSCM) seems to play a crucial role in radiation-related swallowing dysfunctions. Purpose of our study was to quantify operator-related variability in the contouring of PSCM on Computed Tomography (CT) scans and adherence with contours derived from MR images.
What is the origin of the pharyngeal constrictor?
Origin and insertion 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.
Where is the middle pharyngeal constrictor muscle?
Within the pharynx the middle pharyngeal constrictor sits between the superior and inferior pharyngeal constrictor muscles. Stylopharyngeus muscle extends between the superior and middle pharyngeal muscles and is sometimes used to separate these two muscles. Passing on the lateral aspect of the middle pharyngeal muscle is the lingual artery.
How is blood supplied to the superior pharyngeal constrictor?
The majority of the superior pharyngeal constrictor is supplied from the pharyngeal branch of ascending pharyngeal artery, while the smaller part of the muscle receives blood through the tonsillar branch of facial artery. The blood from this region is drained by the pharyngeal venous plexus which ends in the internal jugular vein.