Middle pharyngeal constrictor muscle
| Middle pharyngeal constrictor muscle | |
|---|---|
 | |
 Muscles of the pharynx, viewed from behind, together with the associated vessels and nerves (middle pharyngeal constrictor muscle labeled as Mid. constr. at center) | |
| Details | |
| Origin | Hyoid bone |
| Insertion | Pharyngeal raphe |
| Artery | Ascending pharyngeal artery |
| Nerve | Pharyngeal plexus of vagus nerve |
| Actions | Swallowing |
| Identifiers | |
| Latin | musculus constrictor pharyngis medius |
| TA98 | Lua error in Module:Wikidata at line 746: attempt to index field 'wikibase' (a nil value). |
| TH | {{#property:P1694}} |
| TE | {{#property:P1693}} |
| FMA | {{#property:P1402}} |
| Anatomical terms of muscle [[[d:Lua error in Module:Wikidata at line 865: attempt to index field 'wikibase' (a nil value).|edit on Wikidata]]] | |
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
[edit | edit source]The middle pharyngeal constrictor is a sheet-like, fan-shaped muscle.[1]
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.[1]
Origin
[edit | edit source]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.[1]
- 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.[1]
Insertion
[edit | edit source]The muscle inserts (posteriorly) into the pharyngeal raphe,[1] blending with its contralateral partner at the midline.[citation needed]
Innervation
[edit | edit source]Similarly to the superior and inferior pharyngeal constrictor muscles, it is innervated by a branch of the vagus nerve through the pharyngeal plexus.[citation needed]
Actions/movements
[edit | edit source]The contraction of the muscle constricts the middle portion of the pharynx.[1]
Function
[edit | edit source]The muscle contracts during swallowing:[1] 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.[2][3]
They also have respiratory mechanical effects.[4]
Additional images
[edit | edit source]-
Hyoid bone. Anterior surface. Enlarged.
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Muscles of the neck. Lateral view.
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Middle pharyngeal constrictor muscle
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Middle pharyngeal constrictor muscle
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Deep dissection of larynx, pharynx and tongue seen from behind
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Deep dissection of larynx, pharynx and tongue seen from behind
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Deep dissection of larynx, pharynx and tongue seen from behind
References
[edit | edit source]
This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)
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Further reading
[edit | edit source]- Its role in speech: Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- Its role in Hyoid bone syndrome: Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
External links
[edit | edit source]- lesson8 at The Anatomy Lesson by Wesley Norman (Georgetown University) (latpharyngealitems3)
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