Temporal styloid process

Bone: Styloid process (temporal)
Left temporal bone. Outer surface. (Styloid process visible at center bottom.)
External and middle ear, opened from the front. Right side. (Label for styloid process is bottom center.)
Latin	processus styloideus ossis temporalis
Gray's	subject #34 145

The styloid process is a pointed piece of bone that extends down from the human skull, just below the ear.

Structure

The styloid process is a slender pointed piece of bone just below the ear. It projects down and forward from the inferior surface of the temporal bone, and serves as an anchor point for several muscles associated with the tongue and larynx.

• Its proximal part (tympanohyal) is ensheathed by the vaginal process of the tympanic portion.
• Its distal part (stylohyal) gives attachment to the following:
  • stylohyoid ligament
  • stylomandibular ligament
  • styloglossus muscle (innervated by the hypoglossal nerve)
  • stylohyoid muscle (innervated by the facial nerve)
  • stylopharyngeus muscle (innervated by the glossopharyngeal nerve)

The stylohyoid ligament extends from the apex of the process to the lesser cornu of the hyoid bone, and in some instances is partially, in others completely, ossified.

A small percentage of the population will suffer from an elongation of the styloid process and stylohyoid ligament calcification. This condition is also known as Eagles Syndrome. The tissues in the throat rub on the styloid process during the act of swallowing with resulting pain along the glossopharyngeal nerve. There is also pain upon turning the head or extending the tongue. Other symptoms may include voice alteration, cough, dizziness, migraines, occipital neuralgia , pain in teeth and jaw and sinusitis or bloodshot eyes.

Development

The styloid process arises from endochondral ossification of the cartilage from the second branchial arch.

Additional images

Base of skull. Inferior surface.	Left infratemporal fossa.	Articulation of the mandible. Medial aspect.	Auditory tube, laid open by a cut in its long axis.
Extrinsic muscles of the tongue. Left side.	Dissection of the muscles of the palate from behind.

External links

• SUNY Labs 22:os-0407
• Roche Lexicon - illustrated navigator, at Elsevier 25420.000-1
• Roche Lexicon - illustrated navigator, at Elsevier 34257.000-1

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.

This musculoskeletal system article is a stub. You can help Wikipedia by expanding it. v • d • e