Stylopharyngeus muscle

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

Stylopharyngeus muscle
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
TAA05.3.01.114
FMA46664
Anatomical terms of muscle

Structure

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 supply

The Stylopharyngeus is the only muscle in the pharynx innervated by the glossopharyngeal nerve (CN IX) through branchial motor fibers that originate in the rostral part of the nucleus ambiguus.

Development

Embryological origin is the third pharyngeal arch.

Function

The stylopharyngeus:

  • elevates the larynx
  • elevates the pharynx
  • dilates the pharynx to permit the passage of a large food bolus, thereby facilitating swallowing
gollark: Linux was written from scratch because Unix was proprietary.
gollark: It still uses code from it.
gollark: Linux and stuff are Unix-like/Unix-derived, not literally "Unix".
gollark: Unix was copyrighted or something, so no actual code from it made it into modern unixy OSes.
gollark: https://en.wikipedia.org/wiki/TempleOSAlso not Unix at all.

See also
This article uses anatomical terminology.

Additional images
  • Stylopharyngeus muscle.
  • Left temporal bone. Inferior surface.
  • The cartilages of the larynx. Posterior view.
  • Side view of the larynx, showing muscular attachments.
  • Extrinsic muscles of the tongue. Left side.
  • Muscles of the pharynx, viewed from behind, together with the associated vessels and nerves.
  • Stylopharyngeus muscle
  • Stylopharyngeus muscle
  • Stylopharyngeus muscle
  • Stylopharyngeus muscle

References

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

    This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.