I think one of the most wonderful things about the Anusara principle of skull loop is that it uses the head to bring mind into connection with the body. Far too often, staying in our heads or using our mind can disconnect us from the body. Skillful practice of “skull loop” reminds us that the head is part of the physical body. Skull loop, like all the loops, is a refinement that typically would not be the focus of alignment after not only the major principles (open to grace, muscular energy, inner spiral, outer spiral, organic energy) are set in the pose. It is also the refinement that generally would be done last in most poses because of its distance from the foundation of the pose.
I rarely work skull loop as a focus without also concentrating on shoulder loop and the relationship between the two. Both start in the upper palate. While shoulder loop acts to integrate us and draw us in by hugging the shoulder blades onto the back of the heart as a refinement of muscular energy, skull loop helps us to reach out and serves as a refinement of organic energy — inviting us to extend more fully out of the crown of the head.
Even though skull loop helps remind us how much organic energy — a reaching out with offering that goes all the way from the focal point (more on that another day) out through the periphery, including the head — can empower us, skull loop also has a sweet and subtle reminder to come back to the first principle. Skull loop starts in the upper palate and goes up the back of the skull to the crown of the head. That initial action is what helps with organic energy, and when done powerfully, it can really give a lot more strength and lift to a pose. The second part of the loop softens the forehead and lower eyelids, bringing our inner gaze (drishti) back to the heart. Skull loop thus shows us both that the head is physically an powerful and important part of the movement of the body and that no action of the head is complete unless it brings us back to the heart and the ultimate purpose of our actions and offerings.