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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: * Antrum cardiacum, a dilation that occurs in the esophagus near the stomach (forestomach) * Antrum follicularum, the cavity in the epithelium that envelops the oocyte * Mastoid antrum, a cavity between the middle ear and temporal bone in the skull * Pyloric antrum, the initial portion of the pyloric part of the stomach. This is what is usually referred to as "antrum" in stomach-related topics. * 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: * Antrum of female lepidoptera genitalia 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「antrum」の詳細全文を読む スポンサード リンク
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