Author: Glossary
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Neck of the femur
The heavy column of bone that connects the head of the femur to the shaft.
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Ultrasonic nebulizer
An aerosol produced by the action of a vibrating ultrasonic transducer under water.
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Nearthrosis
A false joint or abnormal articulation, as one developing after a fracture that has not united. The formation of a pseudo joint as a result of a fractured bone failing to properly unite.
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Nearsighted
Able to see clearly only those objects held close to the eye.
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Near point
Closest point of distinct vision with maximum accommodation. This point becomes more distant with age, varying from about 3 in (7.62 cm) at age 2 to 40 in. (101.60 cm) at age 60. The closest point to the eye where an object can be viewed clearly.
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Near-infrared fluorescence imaging
The visualization of tissues within the body after they are bound by fluorescent molecules and stimulated with light in the 700-900 nm wavelength range. NIRI is used to provide images of solid cancers, bone and joint inflammation, and blood flow to tissues.
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Near fall
An event in which a person feels a fall is imminent but avoids it by compensatory action, such as grabbing a nearby object or controlling the fall. People who experience near falls may be at risk of falling and require preventive intervention to avoid potential injury.
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Near-death experience
The perception held by certain individuals that they have glimpsed an afterlife when coming close to death. Mystical experience that occurs to some people who have been near death. Most often people who have an NDE say they felt themselves leave their body, and many report floating above it, observing what’s happening to themselves and…
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Navigational deficits
Any difficulties in orienting oneself in one’s environment or in finding a sure path through a maze. It is more common in elderly persons than in the young and especially in those who have suffered traumatic brain injury or neurodegenerative diseases that cause dementia.
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Navigation
Determining, calculating, and guiding an action in which an object, e.g., a catheter or a surgical instrument, is directed to a particular anatomic position, typically with radiological guidance.