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Middle pharyngeal constrictor muscle

Muscle in the neck

Summary

Muscle in the neck

Field	Value
Name	Middle pharyngeal constrictor muscle
Latin	musculus constrictor pharyngis medius
Image	Musculusconstrictorpharyngismedius.png
Caption	Muscles of the pharynx and cheek (middle pharyngeal constrictor muscle labeled as constrictor pharyngis medius at center left)
Image2	Gray1031.png
Caption2	Muscles of the pharynx, viewed from behind, together with the associated vessels and nerves (middle pharyngeal constrictor muscle labeled as Mid. constr. at center)
Origin	Hyoid bone
Insertion	Pharyngeal raphe
Blood	Ascending pharyngeal artery
Nerve	Pharyngeal plexus of vagus nerve
Action	Swallowing

The middle pharyngeal constrictor is a fan-shaped muscle located in the neck. It is one of three pharyngeal constrictor muscles. It is smaller than the inferior pharyngeal constrictor muscle.

The middle pharyngeal constrictor originates from the greater cornu and lesser cornu of the hyoid bone, and the stylohyoid ligament. It inserts onto the pharyngeal raphe. It is innervated by a branch of the vagus nerve through the pharyngeal plexus. It acts to propel a bolus downwards along the pharynx towards the esophagus, facilitating swallowing.

Structure

The middle pharyngeal constrictor is a sheet-like, fan-shaped muscle.

The muscle's fibers diverge from their origin: the more inferior fibres descend deep to the inferior pharyngeal constrictor muscle; the middle portion of fibres pass transversely; the more superior fibers ascend and overlap the superior pharyngeal constrictor muscle.

Origin

Two parts of the middle pharyngeal constrictor muscle are distinguished according to its sites of origin:

Ceratopharyngeal part - arises (the entire superior margin of) the greater cornu of the hyoid bone.
Chondropharyngeal part - arises from the lesser cornu of the hyoid bone, and (the inferior portion of) the stylohyoid ligament. The chondropharyngeal part represents the muscle's anterior origin.

Insertion

The muscle inserts (posteriorly) into the pharyngeal raphe, blending with its contralateral partner at the midline.

Innervation

Similarly to the superior and inferior pharyngeal constrictor muscles, it is innervated by a branch of the vagus nerve through the pharyngeal plexus.

Actions/movements

The contraction of the muscle constricts the middle portion of the pharynx.

Function

The muscle contracts during swallowing: as soon as the bolus of food is received in the pharynx, the elevator muscles relax, the pharynx descends, and the constrictors contract upon the bolus, and convey it downward towards the esophagus.

They also have respiratory mechanical effects.

Additional images

Image:Gray186.png|Hyoid bone. Anterior surface. Enlarged. Image:Gray385.png|Muscles of the neck. Lateral view. Image:Slide12mmm.JPG|Middle pharyngeal constrictor muscle Image:Slide4iiii.JPG|Middle pharyngeal constrictor muscle Image:Slide1kuku.JPG|Deep dissection of larynx, pharynx and tongue seen from behind Image:Slide2kuku.JPG|Deep dissection of larynx, pharynx and tongue seen from behind Image:Slide3kuku.JPG|Deep dissection of larynx, pharynx and tongue seen from behind

References

Standring, Susan. (2020). "Gray's Anatomy: The Anatomical Basis of Clinical Practice".
(August 1984). "Adaptation in the function of pharyngeal constrictor muscles". [[Otolaryngology–Head and Neck Surgery]].
(1985). "Anatomy and physiology of the pharynx". Gastrointestinal Radiology.
(2000). "Respiratory-related activation and mechanical effects of the pharyngeal constrictor muscles". Respiration Physiology.

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

muscles-of-the-head-and-neck pharynx

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