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Crotch
Crotch
A nonmedical term in common usage for the region where the legs come together, the place where the lower limbs divide.
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Crotan
Crotan is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): crotamiton.
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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.
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
CRP
C-reactive protein.
Cruciate
Cross-shaped. The cruciate ligaments are so-named because they cross each other. For example, there are cruciate ligaments that cross within the knee joint. These ligaments help provide stability and strength to the knee joint.
Cruciate ligament, anterior
The knee joint is surrounded by a joint capsule with ligaments strapping the inside and outside of the joint (collateral ligaments) as well as crossing within the joint (cruciate ligaments). These ligaments provide stability and strength to the knee joint. The anterior cruciate ligament (cruciate means shaped like a cross) is in the front.
Cruciate ligament, posterior
The knee joint is surrounded by a joint capsule with ligaments strapping the inside and outside of the joint (collateral ligaments) as well as crossing within the joint (cruciate ligaments). These ligaments provide stability and strength to the knee joint. The posterior cruciate ligament (cruciate means shaped like a cross) crosses behind the anterior cruciate ligament within the joint.
Crutch
A wooden or metal vertical prop that helps support a disabled person while he or she is walking. Crutches extend from the walking surface to either the armpit or the arm.
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