Trochlear Nerves (IV)

The "trochlear nerves" are number "IV" in the cranial nerve order and are the smallest of the cranial nerves. They arise from the midbrain and carry motor impulses to a pair of external eye muscles, called the "superior obliques," which are not supplied by the oculomotor nerves, but aid in moving the muscles of the eye. The trochlear nerves contain some sensory fibers to transmit information about the condition of certain eye muscles.