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:
Both Ecuador and Japan are located on the Pacific Ring of Fire, which is the worldâs most active earthquake belt. The Ring of Fire is a long chain of active volcanoes and earthquake sites that run around the edge of the Pacific Ocean. It is believed that about 90% of all earthquakes occur along the horse-shaped ring that covers several tectonic plates. The 25,000-mile ring stretches all the way from South America and North America to Japan and New Zealand on the other side of the ocean. USGS. The Ring of Fire stretches from South America to Japan and New Zealand Which country has the most earthquakes? Earthquakes happen all the time all over the world - but a vast majority of the quakes are too weak to be felt.