Involuntary
Done other than in accordance with the conscious will of the individual. The opposite of voluntary.
The terms “voluntary” and “involuntary” apply to the human nervous system and its control over muscles. The nervous system is divided into two parts — somatic and autonomic. The somatic nervous system operates muscles that are under voluntary control. The autonomic (automatic or visceral) nervous system regulates individual organ function and is involuntary. Opening the mouth is voluntary while blushing is involuntary.
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- Involute
1. Literally, to turn inward or roll inward. 2. To decrease in size after an enlargement. The uterus involutes after pregnancy. The thymus involutes after adolescence. 3. To undergo a retrograde change. After treatment, a tumor may involute. 4. To shrink physically and emotionally with advancing age. From the Latin involutio, from in- meaning into […]
- Involution
A retrograde change. After treatment, a tumor may involute; with advancing age, there may be physical and emotional involution.
- Intractable
Unstoppable. For example, intractable diarrhea is diarrhea that can’t be stopped, even with medication, and intractable pain is pain that can’t be stopped, even with medication.
- Intracranial hematoma
Epidural hematoma; Subdural hematoma; Intracerebral hematoma.
- Intracranial
Within the cranium, the bony dome that houses and protects the brain. An intracranial hemorrhage is bleeding within the cranium due, for example, to a stroke or leakage of blood from an aneurysm in the brain. The intracranial pressure is the pressure on brain and the cerebrospinal fluid (CSF) within the cranium. Julius Caesar and […]