Doctor Yamamoto still teaches this method of cranial acupuncture in old age. Among other things, he also teaches in southern Japan, where I learned this acupuncture method from him on site.
I have been using this method since 1997. In my opinion, the focus of using this acupuncture method is on neurological diseases and pain.
I use skull acupuncture according to Yamamoto for back and joint pain, pain in the cervical, thoracic and lumbar spine, sudden hearing loss and tinnitus as well as for the treatment of paralysis and facial paralysis.