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:
Alaska and Hawaii - 50 Years of Statehood. In 1959 Alaska and Hawaii became the last two states to join the USA. They are the only ones not connected to the other 48 states.laska is part of the Pacific  Ring of Fire . It has over 70 volcanoes and every year thousands of earthquakes are reported in the state. In 1867 the United States bought Alaska from Russia for 7 million dollars.