Superior pharyngeal constrictor muscle
The superior pharyngeal constrictor muscle is a quadrilateral muscle of the pharynx. It is the uppermost and thinnest of the three pharyngeal constrictors.
| Superior pharyngeal constrictor muscle | |
|---|---|
 | |
 Muscles of the pharynx, viewed from behind, together with the associated vessels and nerves. | |
| Details | |
| Origin | Medial pterygoid plate, pterygomandibular raphé, alveolar process |
| Insertion | Pharyngeal raphe, pharyngeal tubercle |
| Artery | Ascending pharyngeal artery and tonsillar branch of facial artery |
| Nerve | Pharyngeal plexus of vagus nerve |
| Actions | Swallowing |
| Identifiers | |
| Latin | Musculus constrictor pharyngis superior |
| TA98 | A05.3.01.103 |
| TA2 | 2179 |
| FMA | 46621 |
| Anatomical terms of muscle | |
The muscle is divided into four parts according to its four distincts origins: a pterygopharyngeal, buccopharyngeal, mylopharyngeal, and a glossopharyngeal part. The muscle inserts onto the pharyngeal raphe, and pharyngeal spine. It is innervated by pharyngeal branch of the vagus nerve via the pharyngeal plexus. It acts to convey a bolus down towards the esophagus, facilitating swallowing.
Anatomy
The superior constrictor muscle is a quadrilateral, sheet-like muscle. It is thinner than the middle and inferior constrictor muscles.[1]
Origin
The sites of origin of the muscles collectively are the pterygoid hamulus (and occasionally the adjoining posterior margin of the medial pterygoid plate) anteriorly, (the posterior margin of) the pterygomandibular raphe, the posterior extremity of the mylohyoid line of mandible, and (negligibly) the side of the tongue.[1]
Four parts of the muscle are distinguished according to the origin:
- Pterygopharyngeal part - originating from the lower third of the posterior margin of the medial pterygoid plate and its hamulus
- Buccopharyngeal part - originating from the pterygomandibular raphe
- Mylopharyngeal part - originating from the alveolar process of the mandible above the posterior end of the mylohyoid line
- Glossopharyngeal part - a few fibers originating from the side of the tongue
Insertion
The muscle's fibres extend posterior-ward from its origin to form the midline pharyngeal raphe which then attaches onto the pharyngeal tubercle (of the basilar part of the occipital bone).[1]
Innervation
The superior pharyngeal constrictor muscle receives motor innervation from the pharyngeal plexus of vagus nerve.[1]
Vasculature
Arterial supply is provided primarily by the pharyngeal branch of the ascending pharyngeal artery, and the tonsilar branch of the facial artery.[1]
Relations
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.[2]
There is an interval between superior pharyngeal constrictor and middle pharyngeal constrictor, this space contains glossopharyngeal nerve, lingual nerve and the stylopharyngeus muscle.[2]
The superior fibers arch beneath the levator veli palatini muscle and the Eustachian tube.
Function
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, conveying it downward into the esophagus.
Additional images
Occipital bone seen from outside
Inner surface of the Mandible seen from the side. The insertion of the mylopharyngeal part of the superior pharyngeal constrictor muscle is marked as "sup const".
The internal carotid and vertebral arteries. Right side.
Muscles of the palate seen from behind.
Deep dissection of the floor of mouth. Anterior view.
Deep dissection of larynx, pharynx and tongue seen from behind
References
This article incorporates text in the public domain from page 1143 of the 20th edition of Gray's Anatomy (1918)
- Standring, Susan (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice (42th ed.). New York. p. 712. ISBN 978-0-7020-7707-4. OCLC 1201341621.
{{cite book}}: CS1 maint: location missing publisher (link) - McMinn, R., 1994. Last's anatomy: Regional and applied (9th ed).
External links
- 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 2013-04-22.
