They are attached to bones and respond to neuromuscular signals from the brain that communicate with individual muscle fibers and cause them to contract. Involuntary muscles are found in your ...

Often, hand cramps are caused by muscle spasms, which are described as an uncontrollable or involuntary muscle contraction. These spasms or contractions do not allow the muscle to become relaxed ...

Hypnic jerks are involuntary muscle movements that occur when transitioning from wakefulness to sleep, often making you feel ...