Mastoid antrum 1654286 191016199 2008-02-12T23:29:33Z Arcadian 104523 Entrance to the mastoid antrum {{Infobox Bone | Name = Mastoid antrum | Latin = antrum mastoideum | GraySubject = 230 | GrayPage = 1042 | Image = Gray913.png | Caption = Coronal section of right [[temporal bone]]. ("Tympanic antrum" labeled at upper left.) | Image2 = Gray914.png | Caption2 = The medial wall and part of the posterior and anterior walls of the right [[tympanic cavity]], lateral view. ("Mastoid antrum" labeled at upper left, in dark circle.) | System = | Artery = [[stylomastoid artery]] | MeshName = | MeshNumber = | DorlandsPre = a_50 | DorlandsSuf = 12143566 | }} '''Mastoid antrum''' (or '''tympanic antrum''') is a cavity in the petrous portion of the [[temporal bone]], communicating posteriorly with the [[mastoid cells]] and anteriorly with the epitympanic recess of the [[middle ear]] via the aperture of the mastoid antrum. ==See also== * [[Entrance to the mastoid antrum]] ==Additional images== <gallery> Image:Gray1209.png|Left temporal bone showing surface markings for the tympanic antrum (red), transverse sinus (blue), and facial nerve (yellow). </gallery> ==External links== * {{SUNYAnatomyFigs|30|02|01}} - "Illustration of the continuity of the nasopharynx with the middle ear cavity via the auditory tube." * {{eMedicineDictionary|Mastoid+antrum}} {{Skull}} [[Category:head and neck]]