The teaching brain is a new concept that mirrors the complex, dynamic, and context-dependent nature of the learning brain. In this article, I use the structure of the human nervous system and its sensing, processing, and responding components as a framework for a re-conceptualized teaching system. This teaching system is capable of responses on an instinctual level (e.g., "spinal cord teaching") as well as higher order "student-centered teaching" and even more complex "teaching brain teaching." At the most complex level the teacher and student engage in a synchronistic teaching flow that "achieves" the optimal teaching and learning experience. (Contains 5 figures.)