ANTRUM

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.
Examples include

antrum cardiacum - a dilation that occurs in the esophagus near the stomach (forestomach)

mastoid antrum - Synonym: antrum mastoideum, tympanic antrum, Valsalva's antrum

pyloric antrum - the initial portion of the pyloric part of the stomach

antrum follicularum - the cavity in the epithelium that envelops the oocyte

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