Glossary

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  • Nucha

    Nape, or back of the neck.  

  • Notomelus

    Congenital abnormality in which one or more accessory limbs are attached to the back. A deformed fetus with one or more accessory limbs attached to the back.  

  • Nose

    Nose

    Structure on the face that serves as a passageway for air into and out of the lungs and as an organ of smell. The facial structure that is the main organ of smell and the primary opening into the respiratory system. The supporting bones of the nose, the nasal bones, protrude from the skull. The…

  • Norgestrel

    Progestin used in oral contraceptives.  

  • Norethindrone

    Progestin compound used in oral contraceptives and in the treatment of endometriosis and abnormal uterine bleeding. Adverse effects include gastrointestinal upsets, breast changes, and irregular uterine bleeding.  

  • Noonan’s syndrome

    Disorder, occurring only in males, characterized by short stature, lowset ears, and often decreased fertility.  

  • Nonviable

    Incapable of life or living. Often used in reference to a fetus that has died in utero or to tissues that have been damaged, such as in a bum injury. Incapable of life or of living. This term is frequently used to indicate a fetus that has either died in utero or been born prior…

  • Nonspeciflc urethritis

    Inflammation of the urethra not known to be caused by a specific organism. There are often no symptoms in women; in men, urethral discharge. NSU is most likely sexually transmitted.  

  • Nonrapid eye movement

    Period of sleep representing about 75% of normal sleep time during which dreaming and rapid eye muscle contractions do not occur. NREM sleep periods alternate with short REM (dreaming) sleep periods during normal sleep. Most NREM sleep occurs in four stages: stage 1, characterized by theta rhythm; stage 2, characterized by distinctive sleep patterns; stages…

  • Nonmyelinated

    Nervous system structures not encased by myelin; may be normal, as in parts of the brain and spinal cord, or abnormal. Loss of myelin occurs in several disease states, including multiple sclerosis; these are referred to as demyehnating diseases. Molecules that lack an affinity for water (hydrophobic) because of the absence of opposite charges (poles)…

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