The digestive system of the cnidarian, consisting of the stomach and its connecting canals which perform a similar task to vascular system of higher orders.
The normally restricted space between the parietal and the visceral PLEURA, which slide over one another as the individual breathes in and out. If gas or ?uid are introduced as a result of injury or infection, the pleural surfaces are separated and the pleural space increases in volume. This usually causes breathing diffculties.... pleural cavity
the cavity of the mouth, which contains the tongue and teeth and leads to the pharynx. Here food is tasted, chewed, and mixed with saliva, which begins the process of digestion.... buccal cavity
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