The evolutionary process in all vertebrates began with the fact that the primary axial skeleton (chord), in the process of evolution began to turn into a spine. Other organs such as the digestive system, the circulatory system, the respiratory system, the excretory system, the central nervous system, and others needed further improvement, especially when moving from the aquatic environment to land.
If we recall the ancient Greek myth of Titan atlas, the father of the Pleiades, he was the guardian of the Hesperides garden where golden apples grew and when Perseus, who had recently killed a gorgon jellyfish, came to him and asked for rest, the atlas recalled that he was prophesied to be the son of Zeus and Perseus the son. Zeus, Steals from him the golden apples, which were a great treasure for him, and without thinking rudely drove Perseus, For which he was immediately punished, Perseus took the head of a gorgon jellyfish, which had the ability to turn everyone who looks at it to stone, and Titan turned into mountain (he was very chubby, since then Titan supports the sky, with all the constellations on it.
But it is the axis of the world on which everything rests. In astrology the law of correspondence which sounds - that on the earth that in the sky (macros = microsom) works very well.
So if we draw an analogy with the human body, the axis of our body will be the spine. And if we look in the biological encyclopedia, the first cervical vertebra will be called Atlas in honor of the same titan Atlas described above.