Hernia, hiatus: Protrusion of the stomach up into the opening normally occupied by the esophagus in the diaphragm, the great dome of muscle that separates the thoracic (chest) cavity from the abdomen.
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The hiatus is a hole or opening in the diaphragm, which separates the chest cavity from the abdominal cavity. It is located where the esophagus passes through the diaphragm and enters the stomach in the abdominal cavity.
The abdomen is distal to the chest. The chest is located superiorly to the abdomen in anatomical position.
The stomach and spleen are located in the left upper quadrant of the abdomen.
The ileum is located in the lower abdomen, specifically in the lower part of the small intestine.
kidney
The upper midportion of the abdomen is commonly referred to as the epigastric region. It is located just below the sternum and in the middle of the abdomen. This area contains important organs such as the stomach and part of the liver.