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Cross-section
Cross-sectionIn anatomy, a cross-section is a transverse cut through a structure or tissue. The opposite of a cross-section is a longitudinal section. By analogy, a study may be cross-sectional or longitudinal. RELATED TERMS-------------------------------------- Anatomy The study of form. Gross anatomy involves structures that can be seen with the naked eye. It is as opposed to microscopic anatomy (or histology) which involves structures seen under the microscope. Cross-section In anatomy, a cross-section is a transverse cut through a structure or tissue. The opposite of a cross-section is a longitudinal section. By analogy, a study may be cross-sectional or longitudinal. Tissue Biological tissue is a group of cells that perform a similar function.The study of tissues is known as histology, or, in connection with disease, histopathology.The classical tools for studying the tissues are the wax block, the tissue stain, and the optical microscope, though developments in electron microscopy, immunofluorescence, and frozen sections have all added to the sum of knowledge in the last couple of decades. SIMILAR TERMS-------------------------------------- Cross bite Reverse biting relationship of upper and lower teeth; aka "under bite," as in Class III malocclusuion (prognathic jaw). Cross training Doing two or more aerobic activities such as jogging, bicycling, and swimming on a regular basis. Cross-reactivity The ability of an antibody, specific for one antigen, to react with a second antigen; a measure of relatedness between two different antigenic substances. Cross-sectional study A study done at one time, not over the course of time. A cross-sectional study might be of a disease such as AIDS at one point in time to learn its prevalence and distribution within the population. Also known as a synchronic study. Crossed embolism Passage of a clot (thrombus) from a vein to an artery. When clots in veins break off (embolize) , they travel first to the right side of the heart and, normally, then to the lungs where they lodge. The lungs act as a filter to prevent the clots from entering the arterial circulation. However, when there is a hole in the wall between the two upper chambers of the heart (an atrial septal defect), a clot can crossparadoxically from the right to the left side of the heart, then pass into the arteries. Once in the arterial circulation, a clot can travel to the brain, block a vessel there, and cause a stroke (cerebrovascular accident). Because of the risk of stroke from crossed embolism, it is usually recommended that even small atrial septal defects be closed (repaired). Crossing over The exchange of genetic material between two paired chromosomes. Crossing over is a way to recombine the genetic material so that each person (except for identical twins) is genetically unique. Crossover study A type of clinical trial in which the study subjects receive each treatment in a random order. With this type of study, every patient serves as his or her own control. Crossover trial In crossover trials, each subject receives both treatments being compared (often the test drug for one period and the placebo for another period). Such trials are used for patients who have a stable, usually chronic, condition during both treatment period. Crossroads Regional Medical Center The Crossroads Regional Medical Center is a hospital in Wentzville, Missouri, United States. PREVIOUS AND NEXT TERMS-------------------------------------- Critical incident stress management A way of providing crisis counseling that includes debriefing people who have exposed to a traumatic event. Although this method has been widely practiced, there is no convincing evidence it is effective or beneficial. Crohn colitis Crohn disease involving only the large intestine (colon). Crohn disease is a chronic inflammatory disorder, primarily involving the small and large intestine, but which can affect other parts of the digestive system as well. Crohn ileitis Inflammation of the ileum (the farthest segment of the small intestine) due to Crohn disease. Crohn ileocolitis Crohn disease involving the ileum (the lowest portion of the small intestine) and the colon (the large intestine). Cross training Doing two or more aerobic activities such as jogging, bicycling, and swimming on a regular basis. Cross-section Cross-sectional study A study done at one time, not over the course of time. A cross-sectional study might be of a disease such as AIDS at one point in time to learn its prevalence and distribution within the population. Also known as a synchronic study. Crossed embolism Passage of a clot (thrombus) from a vein to an artery. When clots in veins break off (embolize) , they travel first to the right side of the heart and, normally, then to the lungs where they lodge. The lungs act as a filter to prevent the clots from entering the arterial circulation. However, when there is a hole in the wall between the two upper chambers of the heart (an atrial septal defect), a clot can crossparadoxically from the right to the left side of the heart, then pass into the arteries. Once in the arterial circulation, a clot can travel to the brain, block a vessel there, and cause a stroke (cerebrovascular accident). Because of the risk of stroke from crossed embolism, it is usually recommended that even small atrial septal defects be closed (repaired). Crossing over The exchange of genetic material between two paired chromosomes. Crossing over is a way to recombine the genetic material so that each person (except for identical twins) is genetically unique. Crossover study A type of clinical trial in which the study subjects receive each treatment in a random order. With this type of study, every patient serves as his or her own control. Crotch A nonmedical term in common usage for the region where the legs come together, the place where the lower limbs divide. We thank you for using the Medical Glossary to search for Cross-section. If you have a better definition for Cross-section than the one presented here, please let us know by making use of the suggest a term option. This definition of Cross-section may be disputed by other professionals. Our attempt is to provide easy definitions on Cross-section and any other medical topic for the public at large.
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