The neuraxis or sometimes neuroaxis[1] is the axis of the central nervous system.

During embryological development, the neuraxis is bent by various flexures, contributing to the mature structure of the brain and spinal cord.

First, the neural tube establishes the anterior–posterior dimension of the nervous system, which is called the neuraxis.

Humans (and other primates, to some degree) make this complicated by standing up and walking on two legs.

However, there is a major curve between the brain stem and forebrain, which is called the cephalic flexure.