The anatomic position, also referred to as the standard. It is the consistent position of the human body in which positional reference is made for anatomical nomenclature. It is not reliant on whether the patient is standing, supine, prone, sitting, etc. The position is defined as if the body is standing erect (hips and knees extended), eyes open and looking directly forwards and mouth closed. The arms are by the sides (shoulders adducted), the palms are facing forward (elbows extended and wrists supinated) and the feet parallel and together. In this position, the radius and ulna are parallel. Interestingly, due to the effect of gravity, the anatomic location of viscera is described when the patient is supine (e.g. surface anatomy of the liver). The pelvic cavity is funnel shaped and is located inferior and anterior to the abdominal cavity. Together the abdominal and pelvic cavity can be referred to as the abdominopelvic cavity while the thoracic, abdominal, and pelvic cavities together can be referred to as the ventral body cavity. The pericardial cavity within the mediastinum is located at the center of the chest below the superior mediastinum. The pericardial cavity roughly outlines the shape of the heart. The diaphragm divides the thoracic and the abdominal cavities