It penetrates effectively and improves the cells to form transparent hydrated retia, directly provides skin with abundant nutrition and moisturizes the deep skin.
So all that goo is well-protected by the bones of your vertebrae and cranium, as well as membrane layers, or meninges, before being bathed in a cushy waterbed of clear cerebrospinal fluid.
The trigeminal nerve normally transmits touch, temperature, and other sensations from the skin to most of the face, part of the scalp, and some of the blood vessels and layers covering the cerebral cortex.