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.
Gross Anatomy. The vagus nerve is the longest cranial nerve. It contains motor and sensory fibers and, because it passes through the neck and thorax to the abdomen, has the widest distribution in the body. It contains somatic and visceral afferent fibers, as well as general and special visceral efferent fibers.(See Table 1, below.).ibers from the dorsal motor nucleus X pass through the spinal trigeminal nucleus and tract, emerging from the medulla oblongata lateral surface to join the rest of the vagus. Visceral sensory (afferent general and special visceral). Nerve cells are located in the inferior (nodose) ganglion of the vagus.