Body Cavities and Serous membranes The body maintains its internal organization by means of membranes, sheaths, and other structures that separate compartments. The dorsal (posterior) cavity and the ventral (anterior) cavity are the largest body compartments (Figure 1).Function of these cavities is to contain and protect delicate internal organs. Subdivisions of the Posterior (Dorsal) and Anterior (Ventral) Cavities Ventral cavity: allows changes in the size and shape of the organs as they perform their functions.The anterior (ventral) cavity has two main subdivisions: the thoracic cavity and the abdominopelvic cavity (see Figure 1). 1: The thoracic cavity is superior subdivision of the anterior cavity. Enclosed by the rib cage. Contains the lungs and the heart, which is located in the mediastinum. Diaphragm forms the floor of the thoracic cavity and separates it from the more inferior abdominopelvic cavity. The diaphragm divides the thoracic and the abd...
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