Petrotympanic fissure 4886342 213697483 2008-05-20T13:34:28Z Gracillis 4775916 [[th:รอยแยกพีโทรทิมพานิค]] {{Infobox Bone | Name = Petrotympanic fissure | Latin = f. petrotympanica | GraySubject = 34 | GrayPage = 140 | Image = Gray137.png | Caption = Left [[temporal bone]]. Outer surface. (Petrotympanic fissure is labeled at left, fourth from top.) | Image2 = Gray912.png | 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]]<ref name="titleeMedicine/Stedman Medical Dictionary Lookup!">{{cite web |url=http://www.emedicine.com/asp/dictionary.asp?keyword=Petrotympanic+fissure |title=eMedicine/Stedman Medical Dictionary Lookup! |accessdate=2008-03-07 |format= |work=}}</ref> that runs from the [[temporomandibular joint]] to the [[tympanic cavity]].<ref name="pmid1843474">{{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=}}</ref> 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]].<ref name="titleMedcyclopaedia - Glaserian fissure">{{cite web |url=http://www.medcyclopaedia.com/library/topics/volume_vi_2/g/glaserian_fissure.aspx |title=Medcyclopaedia - Glaserian fissure |accessdate=2008-03-07 |format= |work=}}</ref> [[Image:Petrotympanic fissure.png|thumb|left|300px|[[Base of the skull]]. Arrows indicate petrotympanic fissure.]] ==See also== * [[Chorda tympani]] ==References== {{reflist}} ==External links== * {{SUNYAnatomyFigs|30|06|09}} * {{SUNYAnatomyLabs|30|os|01|08}} {{Gray's}} {{Skull}} {{Foramina of skull}} {{musculoskeletal-stub}} [[th:รอยแยกพีโทรทิมพานิค]]