Category: N

Spontaneous release of material from the nipple; it may be normal, as in the release or colostrum during pregnancy; or it may be a sign of endocrine or infectious disease or neoplasm.  

Infant recently born; a neonate. A term referring to an infant from the moment of birth through the initial weeks of life. A typical full-term newborn baby weighs around 3.5 kg and is about 51 cm in length, ready to thrive outside the womb. The baby’s head might appear misshapen or slightly swollen due to…

Lepton with no electric charge. Neutrinos participate only in weak and gravitational interactions and are therefore very difficult to detect. There are three known types of neutrinos, all of which have very little mass. In physics, a subatomic particle at rest, with no mass and no electric charge. These particles are constantly flowing through the…

Neoplasm consisting chiefly of neurons and nerve fibers. A noncancerous tumor composed of nerve cells and fibers. A neuroma may affect any nerve in the body. Symptoms may include pain, numbness, and tingling in parts of the body supplied by the nerve. If the symptoms are troubling, the neuroma is surgically removed. Neuroma means a…

Altered state of consciousness marked by indifference to the surroundings; quiescence.  

chemical transmitted by a neuron and essential for the activity of adjacent neurons, muscles, or other organs. Important neurohumors are acetylcholine, serotonin, dopamine, and epinephrine.  

Tumor, usually benign, of the sheath surrounding a nerve. A tumor that originates from the protective sheath around a nerve. This condition is also known as neurofibroma or neurilemmoma.  

Process whereby all or part of a nerve, usually of the peripheral nervous system, replaces damaged or missing portions with normal tissue. Typically, nerve regeneration is a slow process; most peripheral nerves grow at a rate of one millimeter or so every thirty days.  

Abnormal condition in which a nerve is subjected to repeated or long-term compression, resulting m nerve damage, often with symptoms of pain and muscle weakness. It most commonly involves nerves located near joints subject to inflammation or swelling, as in arthritis or pregnancy. Carpal tunnel syndrome is a type of nerve entrapment. The compression of…

Harmful pressure on a nerve, causing nerve damage and muscle weakness; nerves over rigid prominences are particularly vulnerable. Rest and alternation of any causal activities often heals the damage.