This is a disambiguation page for the biological term. For the 2018 horror movie, see Antrum (film)
In biology, antrum is a general term for a cavity or chamber, which may have specific meaning in reference to certain organs or sites in the body.
In vertebrates, it may refer specifically to:
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Antrum follicularum, the cavity in the epithelium that envelops the oocyte
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Mastoid antrum, a cavity between the middle ear and temporal bone in the skull
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Stomach antrum, either
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Pyloric antrum, the lower portion of the stomach. This is what is usually referred to as "antrum" in stomach-related topics
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or Antrum cardiacum, a dilation that occurs in the esophagus near the stomach (forestomach)
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Maxillary antrum or antrum of Highmore, the maxillary sinus, a cavity in the maxilla and the largest of the paranasal sinuses
In invertebrates, it may refer specifically to:
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Antrum of female lepidoptera genitalia
