Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «S»:
Semiallogeneic: Sharing some but not all genes, as in parent-child relationships. Individuals are allogeneic when their genes at one or more loci are not identical....
Seminal vesicle: A structure in the male that is about 5 centimeters (2 inches) long and is located behind the bladder and above the prostate gland. The seminal vesicles contribute fluid to the ejaculate....
Senescence: Aging, the process of becoming old, or the state of being old.
As we age, we senesce. No known substance can extend
life, but here are some useful tips for improving the chances of living a long
time and staying healthy:
Eat a balanced diet, including five helpings of fruits and vege...
Senile: 1. Pertaining to old age.
2. Pertaining to the physical decline associated with old age.
3. Pertaining to the mental decline once associated with old age but now known to be due to dementia, such as Alzheimer's disease or cerebral atherosclerosis. "The road to senility is paved with plaque...
Senile chorea: A relatively mild and uncommon disorder that occurs in elderly adults and is characterized by choreic movements.
Chorea refers to rapid complex body movements that look well coordinated and purposeful but are, in fact, involuntary. Chorea was thought suggestive of a grotesque dance. T...
Senile keratosis: Synonymous with actinic keratosis. See: Keratosis, actinic....
Senile lentigo: A benign pigmented flat spot on sun-exposed skin in older adults, especially on the back of the hands and on the forehead. Also called a liver spot....
Senility: 1. Originally, old age.
2. The physical decline associated with old age.
3. The mental decline once associated with old age but now known to be due to dementia, as for instance Alzheimer's disease and atherosclerosis. "The road to senility is paved with plaques." (Paul F. Wehrle, MD [19...
Sensation: In medicine and physiology, sensation refers to the registration of an incoming (afferent) nerve impulse in that part of the brain called the sensorium, which is capable of such perception. Therefore, the awareness of a stimulus as a result of its perception by sensory receptors. (Sensor...
Sense: In biology and medicine, the faculty of sensory reception. The ability to convey specific types of external or internal stimuli to the brain and perceive them. Sensory reception occurs through a process known as transduction in which stimuli are converted into nerve impulses which are relayed...
Sense of smell
Sense of smell: See Olfaction....
Sense, balance: Our sense of balance is regulated by a complex interaction of the following parts of the nervous system:
The inner ears (also called the labyrinth) monitor the directions of motion, such as turning or forward-backward, side-to-side, and up-and-down motions.
The eyes observe where ...
Sense-strand RNA virus
Sense-strand RNA virus: See: Positive-strand RNA virus....
Sensipar: Trade name for cinacalcet, a drug that acts as a calcimimetic. For more information, see: Calcimimetic....
Sensitivity: 1. In psychology, the quality of being sensitive. As, for example, sensitivity training, training in small groups to develop a sensitive awareness and understanding of oneself and of ones relationships with others.
2. In disease epidemiology, the ability of a system to detect epidemics...