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.
In the western United States lies one of the largest and highest mountain ranges on earth. Composed of vast quantities of Granitic rock the Sierra Nevada Mountains and the surrounding topography have distinct geologic structures which point to a period of intense deformation and magmatism as the region was formed.