Category: N

A non-nerve cell of the supporting tissue of the central nervous system and the retina of the eye. This type includes astrocytes, oligodendrocytes, and microglia.  

In logic, an antecedent condition that is wholly and solely capable of producing an effect.  

Health care that is managed by and provided primarily by advanced practitioner nurses. Many community health centers are nurse-led.  

A noninvasive method for studying cardiovascular disease by use of nuclear imaging techniques. These examinations are usually done while the individual is exercising. Coronary artery disease can be investigated as can damage to the myocardium following coronary infarction. The size and function of the ventricles can be evaluated using these techniques.  

A diverse group of tumors, such as carcinoid, islet cell tumors, neuroblastoma, and small-cell carcinomas of the lung. All have dense core granules and produce polypeptides that can be identified by immunochemical methods.  

The cartilaginous capsule that develops in the embryonic skull to enclose the nasal cavity.  

An opening on the surface of compact bone through which blood vessels gain access to the osteons (haversian systems) and the marrow cavity of long bones.  

A temporary canal in the vertebrate embryo between the neural and intestinal tubes. In human development, it is the temporary communication between cavities of the yolk sac and the amnion.  

The canal lying between the lacrimal bone and the inferior nasal conchae. It contains the nasolacrimal duct.  

A type of braille in which only the regular alphabet and punctuation marks are used.