And the route by which the spirit travels through them is such that... In other words, this phenomenon has its own individual law whereby the spirit (ruach) circulates in this way....the place that it touches first is where it emerges. For these names circle around inside, within the body (of Adam Kadmon) in accordance with the laws instituted for them. The spirit finds the limbs that it comes to first and enters into these limbs and body parts, sending forth the radiation through the parts of the face that are related to those bodily limbs and organs.
Adam and the Torah of Kadmon
Kalach Pitchei Chokhmah 34:14