Stylopharyngeus muscle

From Wikipedia, the free encyclopedia
  (Redirected from Stylopharyngeus)
Jump to: navigation, search
Stylopharyngeus muscle
Musculusstylopharyngeus.png
Muscles of the pharynx and cheek. (Stylopharyngeus visible at center left.)
Latin musculus stylopharyngeus
Gray's p.1143
Origin Styloid process (temporal)
Insertion thyroid cartilage (larynx)
Nerve glossopharyngeal nerve (CN IX)
Actions elevate the larynx, elevate the pharynx, swallowing
MeSH Pharyngeal+Muscles
Anatomical terms of muscle

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

Structure[edit]

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.

Innervation[edit]

Stylopharyngeus is the only muscle in the pharynx innervated by the glossopharyngeal nerve (CN IX) and is done by its single motor branch, which supplies special visceral efferent (SVE) fibers to it.

Development[edit]

Embryological origin is the third pharyngeal arch

Function[edit]

The stylopharyngeus:

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

See also[edit]

This article uses anatomical terminology; for an overview, see anatomical terminology.

Additional images[edit]

References[edit]

This article incorporates text from a public domain edition of Gray's Anatomy.

External links[edit]