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 Americas. The Americas face the Pacific Ring of Fire to their west. The section of the San Andreas fault known as the 1857 earthquake rupture zone should break every 200 to 250 years for a magnitude 8 earthquake, Scholz said.he Alpine-Himalayan Zone and the faults related to it are linked with the 2008 Sichuan quake in China, the 2005 quake in Kashmir and the 1999 Izmit quake in Turkey, as well as the earthquakes that often rock Italy.