ONE: Anatomical Facts Old and New: The Polyvagal Theory 1 Overcoming Health Challenges: Are You Fighting the Heads of the Hydra? 1 The Heads of the Hydra: Common Problems Related to Cranial- Nerve Dysfunction 3 Chapter 1:Get to Know Your Autonomic Nervous System ...__....__....__...._ 7 The Twelve Cranial Nerves 7 Cranial