What medical term describes the condition characterized by twitching of muscle fibers?

The medical term that describes the condition characterized by twitching of muscle fibers is "fasciculation." Fasciculations are small, involuntary muscle contractions that can be seen or felt in various skeletal muscles. They are often benign and can occur due to a variety of reasons, such as fatigue, anxiety, or irritation of the nerves that supply the muscles.

In contrast, spasms refer to sudden, involuntary muscle contractions that can involve a larger group of muscles and may cause pain or discomfort. Tremors are rhythmic, oscillating movements typically seen in conditions affecting the nervous system and may involve the hands or other limbs. Cramps are intense, painful contractions of a muscle or muscle group, usually lasting for a short period of time, and are often associated with prolonged exercise or dehydration. Each of these terms describes different types of muscle phenomena, but only fasciculation specifically pertains to the twitching of individual muscle fibers.