antrum /an·trum/ (an´trum) pl. an´tra, antrums [L.] a cavity or chamber.an´tral
mastoid 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. 
)
Pyloric antrum (antrum pyloricum).
tympanic antrum , antrum tympa´nicum mastoid a.
| mastoid antrum n. A cavity in the petrous portion of the temporal bone that communicates with the mastoid sinuses and epitympanic recess of the middle ear. Also called tympanic antrum. |
mastoid antrum,
a cavity continuous with mastoid cells. It is separated from the middle cranial fossa above by the tegmen tympani.
antrum
pl. antra [L.] a cavity or chamber.
mastoid antrum
an air space in the human mastoid portion of the temporal bone communicating with the middle ear and the mastoid cells.
maxillary antrum, antrum maxillare
maxillary sinus, especially of humans.
pyloric antrum, antrum pyloricum
the lumen of the pyloric part of the stomach; the pump of the stomach, regulating the propulsion of food through the pylorus into the duodenum.
tympanic antrum, antrum tympanicum
mastoid antrum.
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