The root of this matter is that the form of every Partzuf, both in general and in detail, depends upon the name MaH, as it is writen: “And the likeness of their faces was the face of a man (Adam)” (Ezekiel 1:10; the numerical value of the letters of ADaM = 45 = MaH). Now this name contains a specific number of powers, and it is these powers that divide up into various particulars, thus producing the limbs of the body with all their different properties.
In some cases the particular components of the power in question unfolded in stages, one after the other, in a gradual developmental sequence. In other cases, the components of the power in question were separated from one another, with one being placed in one location and another in a different location far away from the first. Afterwards, the circuit of the spirit that circulates around all the different parts was instituted, and everything reaches the overall form, which is based on the underlying secret of the “irrigation of the tree”, which is the secret of the name MaH (see Opening 29 Part 3).
Thus, when something happens to and is felt by one part of the Partzuf, it comes to the root, the name of MaH, and from there it immediately reaches the second part, which is likewise a component of the same power whose other component was affected in the first place.