Dictionary

exposure and response prevention A cognitive behavior therapy technique that uses planned exposures and exercises to reduce unwanted responses. Abbreviated E&RP. See also cognitive behavior therapy; exposure.

expression, gene See gene expression.

expressivity The consistency of a genetic disease. For example, Marfan syndrome shows variable expressivity. Some persons with Marfan syndrome merely have long fingers and toes, and others have the full-blown disease, with dislocation of the lens and dissecting aneurysm of the aorta.

expulsion, stage of The second stage of labor, lasting from the full dilation of the cervix until the baby is completely out of the birth canal.

extension The process of straightening or the state of being straight. The opposite of flexion or the state of being bent.

external ear See ear, outer.

external jugular vein The more superficial of the two jugular veins in the neck that drain blood from the head, brain, face, and neck and convey blood toward the heart. The external jugular vein collects most of the blood from the outside of the skull and the deep parts of the face. It lies outside…

external radiation therapy See radiation therapy, external.

extracorporeal shock wave lithotripsy See lithotripsy, extracorporeal shock wave.

evidence-based medicine The judicious use of the best current available scientific research in making decisions about the care of patients. Evidence-based medicine (EBM) is intended to integrate clinical expertise with the research evidence and patient values.

evolution The continuing process of change.

evolution, biologic See biologic evolution.