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 Coastal Range region includes both the mountainous landscape that lines the Pacific coast and the lowlands directly along the shore. Much of the shoreline is characterized by towering sand dunes, as is visible in Oregon Dunes National Recreation Area, part of Siuslaw National Forest (fs.usda.gov).