Antrum

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

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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