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Stylopharyngeus muscle
Template:Muscle infobox The stylopharyngeus is a muscle in the head that stretches between the styloid process and the pharynx.
Contents
Structure
The stylopharyngeus is a long, slender muscle, cylindrical above, flattened below. It arises from the medial side of the base of the styloid process, passes downward along the side of the pharynx between the superior pharyngeal constrictor and the middle pharyngeal constrictor, and spreads out beneath the mucous membrane.
Some of its fibers are lost in the constrictor muscles, while others, joining with the palatopharyngeus muscle, are inserted into the posterior border of the thyroid cartilage.
The glossopharyngeal nerve runs on the lateral side of this muscle, and crosses over it to reach the tongue.
Innervation
Stylopharyngeus is the only muscle in the pharynx innervated by the glossopharyngeal nerve (CN IX) and is done by its motor branch which supplies special visceral efferent (SVE) fibers to it.
Actions
The stylopharyngeus:
- elevates the larynx
- elevates the pharynx
- dilates the pharynx to permit the passage of a large food bolus, thereby facilitating swallowing
Embryological origin
Third pharyngeal arch
See also
Additional images
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Stylopharyngeus muscle.
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Left temporal bone. Inferior surface.
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The cartilages of the larynx. Posterior view.
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Side view of the larynx, showing muscular attachments.
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Extrinsic muscles of the tongue. Left side.
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Muscles of the pharynx, viewed from behind, together with the associated vessels and nerves.
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Stylopharyngeus muscle
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Stylopharyngeus muscle
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Stylopharyngeus muscle
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Stylopharyngeus muscle
External links
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.Template:Muscle-stub
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pt:Músculo estilofaríngeo ru:Шилоглоточная мышца sr:Стилофарингеални мишић sh:Stilofaringealni mišić
