Myelography is an x-ray examination of the spinal canal. A contrast agent is injected through a needle into the space around the spinal cord to display the spinal cord, spinal canal, and nerve roots on an x ray.he purpose of a myelogram is to evaluate the spinal cord and/or nerve roots for suspected compression. Pressure on these delicate structures causes pain or other symptoms. A myelogram is performed when precise detail about the spinal cord is needed to make a definitive diagnosis.
This is one of the only countries that doesnât touch the Pacific Plate. Instead it lies along the border of the Nazca and South American plates but is still considered to be part of the Ring of Fire. Chile records high levels of rainfall that add to earthquakes and tsunamis as natural disasters to be feared here. Chilean natural disasters include:
The Ring of Fire is an area where a large number of earthquakes and volcanic eruptions occur in the basin of the Pacific Ocean. In a 40,000 km (25,000 mi) horseshoe shape, it is associated with a nearly continuous series of oceanic trenches, volcanic arcs, and volcanic belts and/or plate movements. It has 452 volcanoes and is home to over 75% of the worldâs active and dormant volcanoes. An easy way to think about the Ring of Fire is to imagine a giant red band stretching along the perimeter of the Pacific Ocean. And yes, that includes the entire west coast of the United States and the entire southern coast of Alaska. 10 major volcanoes along the Ring of Fire have suddenly roared to life in recent months. The following are short excerpts from news reports about those eruptionsâ¦ Volcano creates new island off the coast of Japan: A dramatic volcanic eruption in the Pacific Ocean has created a tiny new islet in Japanâs territorial waters, officials said Thursday, the first time in decades the nation has seen the phenomenon.