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antrum[an´trum] (pl. an´tra, antrums) (L.)
a cavity or chamber. adj., adj an´tral.
antrum of Highmore maxillary sinus.
mastoid antrum an air space in the mastoid portion of the temporal bone communicating with the middle ear and the mastoid cells.
antrum maxilla´re (maxillary antrum) maxillary sinus.
pyloric antrum (antrum pylo´ricum) the proximal, expanded portion of the pyloric part of the stomach.
tympanic antrum (antrum tympa´nicum) mastoid antrum.
the largest of the paranasal sinuses occupying the body of the maxilla, communicating with the middle meatus of the nose.
maxillary sinusA facial region that is one of a pair of usually symmetrical, hollow cavities located in the maxillary body. It is pyramidal, with the base projecting medially on the nasal cavity and laterally to the apex of the zygoma.
Maxillary sinus anatomy
• Roof—Formed by maxilla’s alveolar process (the roof forms the floor of the orbit).
• Walls (anterior)—Forms part of nasal cavity’s lateral wall, which is the facial surface of the medial maxilla.
• Walls (posterior)—Relates to the infratemporal space and pterygopalatine fossa.
The maxillary sinus; a cavity in the maxillary bone communicating with the middle meatus of the nasal cavity.
See also: antrum