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.
The term highland or uplands is used to denote any mountainous region or elevated mountainous plateau. Generally speaking, upland (or uplands) tends to refer to ranges of hills, typically up to 500-600m. Highland (or highlands) is usually reserved for ranges of low mountains.