This app contains the Easy Ways series on the Head and Neck and Limbs. HN14 - Rules and Exceptions in the Head and Neck. Part 1. HN15 - Rules and Exceptions in the Head and Neck. Part 2. HN16 - Parasympathetic Connections in the Head. HN17 - Role of the Cranial Nerves in Autonomic Distribution in the head. HN18 - Types of Ganglia.