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.
n a chain of mountains in the U.S. and Canada: a continuation of the Sierra Nevada range from N California through Oregon and Washington to British Columbia. Highest peak: Mount Rainier, 4392 m (14408 ft.). Darling Range. n a ridge in SW Western Australia, parallel to the coast.