Cranial nerve IV is the Trochlear nerve. Cranial nerve VI is the Abducent nerve. Proprioceptive --means capable of receiving stimuli originating in muscles, tendons, and other internal tissues. Proprioceptive impulse --means a nerve impulse that originates with a sensory ending in muscle, joint, or tendon. Such impulses provide information to the central nervous system about the relative position of body parts. Trochlear nerve is primarily motor, emerge from the dorsol midbrain and carry motor and carry proprioreceptor impules to and from superior oblique muscle of the eyeballs. The trochlear nerve is the smallest (thinnest) cranial nerve and the only one whose fibers originate totally from the contralateral nucleus. The trochlear nerve provides motor innervation to only one of the extraocular muscles of the eye, the superior oblique muscle. Fibers arising from this nucleus initially descend for a short distance in the brainstem and then course dorsally in the periaqueductal gray matter. The fibers decussate posteriorly and emerge from the brainstem at the junction of the pons and midbrain. Abducent nerve is also primarily motor and emerge from the pons and serve the motor and properceptive functions of lateral rectus muscles of the eye balls. The abducent nerve innervates only one extraocular muscle, the lateral rectus. The abducent nerve supplies motor innervation to the lateral rectus muscle, which abducts the eye. Normally, both eyes move together regardless of the direction of gaze. This is achieved by precise coordinated action of all the extraocular muscles of both eyes. The oculomotor, trochlear, and abducens nuclei are interconnected and are controlled by higher brain centers of the cerebral cortex as well as by the brainstem. Solution Cranial nerve IV is the Trochlear nerve. Cranial nerve VI is the Abducent nerve. Proprioceptive --means capable of receiving stimuli originating in muscles, tendons, and other internal tissues. Proprioceptive impulse --means a nerve impulse that originates with a sensory ending in muscle, joint, or tendon. Such impulses provide information to the central nervous system about the relative position of body parts. Trochlear nerve is primarily motor, emerge from the dorsol midbrain and carry motor and carry proprioreceptor impules to and from superior oblique muscle of the eyeballs. The trochlear nerve is the smallest (thinnest) cranial nerve and the only one whose fibers originate totally from the contralateral nucleus. The trochlear nerve provides motor innervation to only one of the extraocular muscles of the eye, the superior oblique muscle. Fibers arising from this nucleus initially descend for a short distance in the brainstem and then course dorsally in the periaqueductal gray matter. The fibers decussate posteriorly and emerge from the brainstem at the junction of the pons and midbrain. Abducent nerve is also primarily motor and emerge from the pons and serve the motor and properceptive functions o.