The different types of volcanoes are: composite (or stratovolcanoes), shield, cinder cones and spatter cones. Throughout the world, one can see pictures of the four types of volcanoes, each type indicative of the active underground world we often view as static.
Vagus nerve stimulation (VNS TherapyÂ®) is designed to prevent seizures by sending regular, mild pulses of electrical energy to the brain via the vagus nerve. These pulses are supplied by a device something like a pacemaker. 1  The VNS device is sometimes referred to as a pacemaker for the brain..  The vagus nerve is part of the autonomic nervous system, which controls functions of the body that are not under voluntary control, such as the heart rate.
A small device is implanted into the body through the left side of the chest. The device is called a. vagus nerve stimulator. It also is known as a pulse generator. It produces repeating, low-level pulses of electrical current. The pulse generator is connected. to a wire that attaches to the vagus nerve. Nerves are cordlike bundles of brain cells (neurons). They carry messages to and from the brain and other parts. of the body. The vagus nerve has many paths.