Petrotympanic fissure

Petrotympanic fissure

Infobox Bone
Name = Petrotympanic fissure
Latin = f. petrotympanica
GraySubject = 34
GrayPage = 140


Caption = Left temporal bone. Outer surface. (Petrotympanic fissure is labeled at left, fourth from top.)


Caption2 = The right membrana tympani with the hammer and the chorda tympani, viewed from within, from behind, and from above. (Glaserian fissure labeled at center left.)
System =
Precursor =
MeshName =
MeshNumber =
DorlandsPre = f_08
DorlandsSuf = 12365631
The petrotympanic fissure is a fissure in the temporal bone [EMedicineDictionary|Petrotympanic+fissure] that runs from the temporomandibular joint to the tympanic cavity.cite journal |author=Eckerdal O |title=The petrotympanic fissure: a link connecting the tympanic cavity and the temporomandibular joint |journal=Cranio |volume=9 |issue=1 |pages=15–22 |year=1991 |pmid=1843474 |doi=]

The mandibular fossa is bounded, in front, by the articular tubercle; behind, by the tympanic part of the bone, which separates it from the external acoustic meatus; it is divided into two parts by a narrow slit, the petrotympanic fissure.

It opens just above and in front of the ring of bone into which the tympanic membrane is inserted; in this situation it is a mere slit about 2 mm. in length. It lodges the anterior process and anterior ligament of the malleus, and gives passage to the anterior tympanic branch of the internal maxillary artery.

Eponym

It is also known as the "Glaserian fissure", after Johann Glaser.cite web |url=http://www.medcyclopaedia.com/library/topics/volume_vi_2/g/glaserian_fissure.aspx |title=Glaserian fissure |accessdate=2008-03-07 |format= |work=Medcyclopaedia]

ee also

* Chorda tympani

References

External links

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  • Fissure — A cleft or groove. A fissure can be normal or abnormal. A fissure in the cerebral cortex is a normal feature. It is a deep fold that involves the entire thickness of the brain wall. A fissure in the anus is distinctly abnormal. It is a painful… …   Medical dictionary

  • Glaserian fissure — Gla·se·ri·an fissure glə zir ē ən n PETROTYMPANIC FISSURE Gla·ser glä zər Johann Heinrich (1629 1675) Swiss anatomist and surgeon. Glaser was a professor of anatomy who notably reformed clinical instruction. One of the first physicians to make… …   Medical dictionary

  • glaserian fissure — glə]ˈzirēən , glä] noun Usage: usually capitalized G Etymology: glaserian from Johann Heinrich Glaser died 1675 Swiss anatomist + English ian : petrotympanic fissure …   Useful english dictionary

  • Glaserian fissure — noun see petrotympanic fissure …   Useful english dictionary

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