As per the name, the cranial nerves originate from the head and neck. Usually they are either motor or sensory but some fulfil both functions. The functions these nerves are responsible for are the special senses except for touch. The vagus nerve is responsible for the autonomic nervous system, specifically the parasympathetic nervous system. It interfaces with a variety of organs in the neck, chest and abdomen.
The spinal nerves are responsible for supplying muscles of the limbs and the trunk and provide sensation to the skin. They also supply the muscles and other structures that surround the spine. As discussed before,