This is what makes it possible to find that the lights of BaN emerged through the Eyes while the lights of SaG emerged through the Ears, Nose and Mouth. For the circuit of SaG is arranged in such a way that it first reaches the organs that are structurally coupled with the Ears, Nose and Mouth, and its radiations passed out from there immediately. The circuit of BaN, on the other hand, reaches the limbs that are structurally coupled with the Eyes, and the same applies to MaH in relation to the Forehead.
The Lights of BaN, SaG, and MaH Unfolding
Kalach Pitchei Chokhmah 34:15