A thin membrane which completely or partially occludes the vaginal opening. This fold of mucous membrane is usually present at birth at the orifice of the vagina. In medicine, it is called the vaginal membrane or the hymen. Hymen is a Greek word meaning “skin” or “membrane.” The ancient Greeks applied the word “hymen” to all kinds of membranes including, for example, the membrane that surrounds the heart (the pericardium). Starting in the 1500s the word was restricted to refer only to the vaginal membrane.
(1) failure of the ovaries to produce, develop or release eggs (ova); (2) ovary enlargement; (3) failure to menstruate; (4) irregular menstruation; (5) obesity; and (6) infertility. It must be noted that failure to menstruate is normal before puberty, during pregnancy, during early lactation and after menopause. It is probably abnormal at other times and […]
- Virtual colonoscopy
A method for examining the colon by taking a series of x-rays and then using a computer to reconstruct three-dimensional pictures (a CT scan) of the interior surfaces of the colon from these x-rays. The pictures can be saved, manipulated to better viewing angles, and reviewed after the procedure. The procedure requires a 48-hour low-fiber […]
The ability of an agent of infection to produce disease. The virulence of a microorganism is a measure of the severity of the disease it causes.
A microorganism that is smaller than a bacterium that cannot grow or reproduce apart from a living cell. A virus invades living cells and uses their chemical machinery to keep itself alive and to replicate itself. It may reproduce with fidelity or with errors (mutations); this ability to mutate is responsible for the ability of […]
- Virus, attenuated
a virus that is capable of stimulating an immune response and creating immunity but not of causing illness.