Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «V»:
Viruses: Small living particles that can infect cells and change
how the cells function. Infection with a virus can cause a person to develop symptoms. The
disease and symptoms that are caused depend on the type of virus and the type of cells
that are infected....
Viscera: The internal organs of the body, specifically those within the chest (as the heart or lungs) or abdomen (as the liver, pancreas or intestines).
The singular of "viscera" is "viscus" meaning in Latin "an organ of the body."...
Visceral: Referring to the viscera, the internal organs of the body, specifically those within the chest (as the heart or lungs) or abdomen (as the liver, pancreas or intestines).
In a figurative sense, something "visceral" is felt "deep down." It is a "gut feeling."...
Visceral leishmaniasis: A chronic and potentially fatal parasitic disease of the viscera (particularly the liver, spleen, bone marrow and lymph nodes) due to infection by Leishmania donovani. Also known as Kala-azar.
Leishmania donovani is transmitted by sandfly bites in parts of Asia (primarily Ind...
Visceral pericardium: The
inner layer of the pericardium, a conical sac of fibrous tissue that surrounds
the heart and the roots of the great blood vessels.
The pericardium has outer and inner coats. The outer coat
is tough and thickened, loosely cloaks the heart, and is attached to the central ...
Viscus: An internal organ of the body, specifically one within the chest (as the heart or lungs) or abdomen (as the liver, pancreas or intestines).
"Viscus" is the Latin word for "an organ of the body." The plural of "viscus" is "viscera."...
Vision therapy: The use of special eye exercises
to address eye defects, such as strabismus. Some vision
therapists also claim that eye exercises can help people
with neurological or learning disabilities. This approach
is not proven for the latter use, although some patients do
Vision, binocular: See: Binocular vision....
Vision, blurred: See: Blurred vision....
Vision, central: See: Central vision....
Vision, low: Visual loss that cannot be corrected with eyeglasses or contact lenses and that interferes with daily living activities....
Vision, macular: The macula is a special area in the center of the retina, the light-sensitive layer of tissue at the back of the eye. As we read, light is focused onto our macula. There, millions of cells change the light into nerve signals that tell the brain what we are seeing. This is called our...
Vision, peripheral: See: Peripheral vision....
Vision, tubular: See: Tubular vision; Tunnel vision....
Vision, tunnel: See: Tunnel vision....