In the last 150 yrs, the arcuate foramen is really a bone arch that presents up sometimes on the initial vertebra (the atlas). And the initial cervical nerve go through it. Its significance isn't understood despite a hundred years of observations. Two hypotheses explain the origin of the atlas...

Modern life has many advantages, but there is one major drawback. The problem I am referring to is that our secondary knowledge keeps us from being able be certain about many things. Nietzsche called this "primary knowledge," which is the original type of knowledge. It is the knowledge that...