I've been experimenting with a beck circuit and found that it will penetrate bone. ie, in my own trials, I managed to place two electrodes on each side of my lower left mandibular(pls don't attempt this), and discovered that the current could be felt through the entire bone. I also discovered that applying the beck circuit to the bone induced a metallic taste in my mouth as well.
Aside from this, I've had great success with this process as it has had a very positive effect on my bone infection. However, I'd caution against the use of electrical impulses on the head as it runs the risk of optical nerve damage(see: blinking eyes). And so I want to be sure not to encourage anyone to try this themselves.
Case and point, since the electrical impulses have proven to pass solid bone, I'd say it would certainly pass soft tissue and/or blood vessels.