<P> Damage to the trochlear nerve (IV) can also cause diplopia with the eye adducted and elevated . The result will be an eye which cannot move downwards properly (especially downwards when in an inward position). This is due to impairment in the superior oblique muscle, which is innervated by the trochlear nerve . </P> <P> Damage to the abducens nerve (VI) can also result in diplopia . This is due to impairment in the lateral rectus muscle, which is innervated by the abducens nerve . </P> <P> The trigeminal nerve (V) comprises three distinct parts: The Ophthalmic (V1), the Maxillary (V2), and the Mandibular (V3) nerves . Combined, these nerves provide sensation to the skin of the face and also controls the muscles of mastication (chewing). Conditions affecting the trigeminal nerve (V) include trigeminal neuralgia, cluster headache, and trigeminal zoster . Trigeminal neuralgia occurs later in life, from middle age onwards, most often after age 60, and is a condition typically associated with very strong pain distributed over the area innervated by the maxillary or mandibular nerve divisions of the trigeminal nerve (V and V). </P> <P> Lesions of the facial nerve (VII) may manifest as facial palsy . This is where a person is unable to move the muscles on one or both sides of their face . A very common and generally temporary facial palsy is known as Bell's palsy . Bell's Palsy is the result of an idiopathic (unknown cause), unilateral lower motor neuron lesion of the facial nerve and is characterized by an inability to move the ipsilateral muscles of facial expression, including elevation of the eyebrow and furrowing of the forehead . Patients with Bell's palsy often have a drooping mouth on the affected side and often have trouble chewing because the buccinator muscle is affected . </P>

Where do the cranial nerves attach to the brain