Stylopharyngeus muscle

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The stylopharyngeus is a muscle in the head that stretches between the temporal styloid process and the pharynx.

Stylopharyngeus muscle
Musculusstylopharyngeus.png
Muscles of the pharynx and cheek. (Stylopharyngeus visible at center left.)
Details
OriginStyloid process (temporal)
Insertionthyroid cartilage (larynx)
Nerveglossopharyngeal nerve (CN IX)
Actionselevate the larynx, elevate the pharynx, swallowing
Identifiers
Latinmusculus stylopharyngeus
TA98A05.3.01.114
TA22190
FMA46664
Anatomical terms of muscle

StructureEdit

The stylopharyngeus is a long, slender muscle, cylindrical above, flattened below. It arises from the medial side of the base of the temporal 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 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.

Nerve supplyEdit

The stylopharyngeus is the only muscle in the pharynx innervated by the glossopharyngeal nerve (CN IX) via branchial motor neurons with their cell bodies in the rostral part of the nucleus ambiguus.

DevelopmentEdit

Embryological origin is the third pharyngeal arch.

FunctionEdit

The stylopharyngeus:

  • elevates the larynx
  • elevates the pharynx
  • dilates the pharynx to permit the passage of a large food bolus, thereby facilitating swallowing

See alsoEdit

Additional imagesEdit

ReferencesEdit

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