Sometimes you may have atrial flutter that develops into atrial fibrillation and vice versa. The risk factors for and the symptoms and causes of atrial flutter are similar to those of atrial fibrillation. For example, strokes are also a concern in someone with atrial flutter. As with atrial fibrillation, atrial flutter is usually not life-threatening when it's properly treated.
Nerves and Nerve Types. There three types of nerves in the central nervous system: motor neurons, sensory neurons and autonomic neurons. Motor nerves send impulses or signals from the brain and spinal cord to all of the muscles in the body.
Your nerves will tell your leg muscles to move. Nerve cells carry messages from one part of the body to another. There are three different types of neurones, each with a slightly different function. 1  Sensory neurones carry signals from sensory receptors to the spinal cord and brain. 2  Together, the spinal cord and brain make up the central nervous system.