Category: Aq-Ar

A canal between the third and fourth ventricles in the brain within the system of four communicating cavities that are continuous with the central canal of the spinal cord. The ventricles are filled with cerebrospinal fluid, which is carried by the aqueduct of Sylvius.

A channel for the passage of fluid.

A water channel. Aquaporins form pores in the membranes of cells and selectively conduct water molecules through the membrane, while preventing the passage of ions (such as sodium and potassium) and other small molecules. Aquaporins are typically composed of identical subunit proteins. Water molecules traverse the narrowest portion of the water channel in single file.…

An abnormal and persistent fear of water. Sufferers from aquaphobia experience anxiety even though they realize the water in an ocean, a river, a lake, a creek or even a bathtub may pose no imminent threat. They generally avoid such activities as boating and swimming. Around the house, they may fear the water in a shower or tub and…

A skin reaction that results from contact with water. Urticaria is the medical term for hives, a skin reaction characterized by red, raised, itchy welts on the skin. Urticaria can be related to an allergic reaction, but its cause is not determined in many cases. The skin changes can come and go, change size, and move to different locations in the body. Symptoms…

A rare condition of the skin of the palms and occasionally of the soles of the feet. It most often affects women and teens. Symptoms of aquagenic keratoderma include swelling, whitish bumps, and excessive wrinkling of the skin of the palms after contact with water or sweat. A burning sensation, itching, and pain are often present. The symptoms go away gradually…

Aquaporin.