structure of axon. in nervous system: Axon. The axon arises from the soma at a region called the axon hillock, or initial segment. This is the region where the plasma membrane generates nerve impulses; the axon conducts these impulses away from the soma or dendrites toward other neurons.
The type of land form that the Sierra Nevada and coastal ranges have is called a basin.
Mountain Ranges. High, rugged mountain ranges border the Central Plateau. On the west is the Sierra Madre Occidental, which has a number of spectacular volcanoes. A second range, the Sierra Madre Oriental, lies along the eastern edge of the plateau and joins with the Sierra Madre Occidental near Mexico City.