Draw the appearance of each of these spaghetti

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4.Draw the appearance of each of these spaghetti sectionsbelow, and verify the accuracy of your section identificationswith your instructor. Dorsal Body Cavity M01_MARI6128_10_SE_CH01.QXD 1/17/11 8:10 PM Page 6
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and the vertebral (or spinal ) cavity, within which the deli- cate spinal cord is protected by the bony vertebral column. Because the spinal cord is a continuation of the brain, these cavities are continuous with each other. Ventral Body Cavity Like the dorsal cavity, the ventral body cavity is subdivided. The superior thoracic cavity is separated from the rest of the ventral cavity by the dome-shaped diaphragm. The heart and lungs, located in the thoracic cavity, are afforded some mea- sure of protection by the bony rib cage. The cavity inferior to the diaphragm is often referred to as the abdominopelvic cavity. Although there is no further physical separation of the ventral cavity, some prefer to describe the ab- dominopelvic cavity in terms of a superior abdominal cav- ity, the area that houses the stomach, intestines, liver, and other organs, and an inferior pelvic cavity, the region that is partially enclosed by the bony pelvis and contains the repro- ductive organs, bladder, and rectum. Notice in Figure 1.5 that the abdominal and pelvic cavities are not continuous with each other in a straight plane but that the pelvic cavity is tipped away from the perpendicular. Serous Membranes of the Ventral Body Cavity The walls of the ventral body cavity and the outer surfaces of the organs it contains are covered with an exceedingly thin, double-layered membrane called the serosa, or serous mem- brane. The part of the membrane lining the cavity walls is re- ferred to as the parietal serosa, and it is continuous with a similar membrane, the visceral serosa, covering the external surface of the organs within the cavity. These membranes pro- duce a thin lubricating fluid that allows the visceral organs to slide over one another or to rub against the body wall with minimal friction. Serous membranes also compartmentalize the various organs so that infection of one organ is prevented from spreading to others. The specific names of the serous membranes depend on the structures they envelop. Thus the serosa lining the ab- dominal cavity and covering its organs is the peritoneum, that enclosing the lungs is the pleura, and that around the heart is the pericardium (see Figure 8.1). Abdominopelvic Quadrants and Regions Because the abdominopelvic cavity is quite large and con- tains many organs, it is helpful to divide it up into smaller ar- eas for discussion or study.
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  • Fall '19
  • abdominopelvic cavity, Anatomical terms of location, ventral body cavity

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