Moulds can be of a single cavity or multiple cavities. The secondary body cavity, the coelom, forms by the partitioning of three body cavities. He introduced dental fillings as treatment for dental cavities. Sugars are commonly associated with dental cavities. Endothelial cells are cells that line internal cavities including blood vessels and glands. The fluid fills the inside of body cavities. In this system, deoxygenated blood collects around the heart in cavities (sinuses). There are several methods for forming internal cavities in extrusions. It does not feed the bacteria that form plaques and cause dental cavities. They use the heel-pad to shuffle inside the nest cavities or holes. The diaphragm divides the thoracic and the abdominal cavities. Many organs reside within cavities within the body. The anterior aspect of the nasopharynx communicates through the choanae with the nasal cavities. Agates are most commonly found as nodules within the cavities of volcanic rocks. It enters into the formation of the roofs of the orbital and nasal cavities.