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Then, when the team injected a small amount of foam into the abdominal cavity of mice, within one day the gene therapy transferred from the foam to the targeted cells without significant side effects.

But because it is located deep inside the abdominal cavity and shifts slightly with every breath, it can be difficult to see.

The denser the muscle, the better: Men with the densest muscle in their abdominal cavity had about one quarter the risk of coronary heart disease later on.

There are three main cavities in the body: one around the heart, the abdominal cavity, and the pleural cavity surrounding the lungs.

Using a specialized appendage near his mouth called a pedipalp, the male spider reached forward and carefully slid a packet of sperm into the female’s abdominal cavity.