Here's an article inspired by TV's Bionic Woman:

This report talks about stiff tissue walls that can cause migraines:

Plastic surgeons are freeing the space around these nerves to relieve pressure and alleviate pain or numbness. Patients with facial paralysis, due to trauma or tumors, often lose the ability to use facial muscles around the mouth which leads to asymmetry or a permanent frown. Having a permanent frown may negatively impact people’s perceptions of an individual. Botox® can be used to paralyze the normal functioning muscles while patients have physical therapy to strengthen the damaged muscles and restore symmetry to the face. “The steps we are taking in peripheral nerve surgery are dramatically changing the way patients are treated and positively impacting their lives,” said Ivica Ducic, MD, ASPS Member Surgeon and course instructor. “Considering what we’ve accomplished over the last several years, we are definitely entering into a new age of reconstructive plastic surgery.”