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.
Like most other cells in an organism, a nerve cell generally has both a nucleus and a cell body. Around the cell body, there are extensions called dendrites, which are specialized in receiving different kinds of stimuli depending on the location and purpose of the cell.he three basic types of nerve cells are motor neurons, sensory neurons and interneurons. A motor neuron is a cell that transmits a signal to a muscle or gland.