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.
A mountain's height above sea level is called its elevation with its highest point called a summit or peak. A mountain range is a group or chain of mountains located close together. Since neighboring mountains often share the same geological origins, mountain ranges have similar form, size and age. Long chains of mountain ranges combine to form mountain belts.