The cranial nerves are a set of twelve pairs of nerves that travel to and from the brain. Each has a different function. For example, the olfactory nerve is essential for detecting smells. The ...

The trochlear nerve is the fourth of 12 cranial nerves that emerge from the brain and extend down the head, neck, and torso. Cranial nerves help control sensory innervation: i.e., the ability to ...