Superior pharyngeal constrictor muscle

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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.

Superior pharyngeal constrictor muscle
Musculusconstrictorpharyngissuperior.png
Muscles of the pharynx and cheek.
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Muscles of the pharynx, viewed from behind, together with the associated vessels and nerves.
Details
OriginMedial pterygoid plate, pterygomandibular raphé, alveolar process
InsertionPharyngeal raphe, pharyngeal tubercle
ArteryAscending pharyngeal artery and tonsillar branch of facial artery
NervePharyngeal plexus of vagus nerve
ActionsSwallowing
Identifiers
LatinMusculus constrictor pharyngis superior
TAA05.3.01.103
FMA46621
Anatomical terms of muscle

The muscle is divided into four parts: A pterygopharyngeal, buccopharyngeal, mylopharyngeal and a glossopharyngeal part.

Origin and insertionEdit

The four parts of this muscle arise from:
- the lower third of the posterior margin of the medial pterygoid plate and its hamulus (Pterygopharyngeal part)
- from the pterygomandibular raphe (Buccopharyngeal part)
- from the alveolar process of the mandible above the posterior end of the mylohyoid line (Mylopharyngeal part)
- and by a few fibers from the side of the tongue (Glossopharyngeal part)

The fibers curve backward to be inserted into the median raphe, being also prolonged by means of an aponeurosis to the pharyngeal spine on the basilar part of the occipital bone.

The superior fibers arch beneath the levator veli palatini muscle and the Eustachian tube.

RelationsEdit

The interval between the upper border of the muscle and the base of the skull is closed by the pharyngeal aponeurosis, and is known as the [[sinus of Morgagni (pharynx)|sinus of Morgagni]. There is an interval between superior pharyngeal constrictor and middle pharyngeal constrictor, this space contains glossopharyngeal nerve and styloglosseus muscle.

ActionEdit

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 into the esophagus.

InnervationEdit

The superior pharyngeal constrictor muscle is innervated by the pharyngeal branch of the vagus nerve via the pharyngeal plexus.

Additional imagesEdit

ReferencesEdit

This article incorporates text in the public domain from page 1143 of the 20th edition of Gray's Anatomy (1918)

External linksEdit

  • lesson8 at The Anatomy Lesson by Wesley Norman (Georgetown University) (latpharyngealitems3)
  • "Anatomy diagram: 05287.011-1". Roche Lexicon - illustrated navigator. Elsevier. Archived from the original on 2014-01-01.