antrum /an·trum/ (an´trum) pl. an´tra, antrums [L.] a cavity or chamber.an´tral
tympanic antrum,
cardiac antrum the short conical portion of the esophagus below the diaphragm, its base being continuous with the cardiac orifice of the stomach.
frontal antrum see under sinus.
antrum of Highmore maxillary sinus.
mastoid antrum , antrum mastoi´deum an air space in the mastoid portion of the temporal bone communicating with the tympanic cavity and the mastoid cells.
antrum maxilla´re , maxillary antrum maxillary sinus.
pyloric antrum , antrum pylo´ricum the dilated portion of the pyloric part of the stomach, between the body of the stomach and the pyloric canal. 
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Pyloric antrum (antrum pyloricum).
tympanic antrum , antrum tympa´nicum mastoid a.
| tympanic antrum n. See mastoid antrum. |
tympanic antrum,
a relatively large, irregular cavity in the superior anterior part of the mastoid process of the temporal bone, communicating with the mastoid air cells and lined by the extension of the mucous membrane of the tympanic cavity. The bony tegmen tympani separates the tympanic antrum from the middle fossa of the cranial cavity, and the lateral semicircular canal of the internal ear projects into the antrum. See also mastoid process.
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