Cranial Nerves -Detailed description of function of cranial nerves

Cranial Nerves -Detailed description of function of cranial nerves Names of Cranial Nerves CN I: Olfactory - Sensory CN II: Optic - Sensory CN III: Oculomotor - Motor CN IV: Trochlear - Motor CN V: Trigeminal - Both CN VI: Abducens - Motor CN VII: Facial - Both CN VIII: Vestibulocochlear - Sensory CN IX: Glossopharyngeal - Both CN X: Vagus - Both CN XI: Accessory - Motor CN XII: Hypoglossal - Motor Cranial Nerve I: Olfactory Sensory - Sense of smell Olfactory receptors in nasal cavity to olfactory nerve tracts to olfactory area in temporal lobe of brain Cranial Nerve II: Optic Sensory - Vision Visual signals begin in the retina Passes to neurons forming optic nerves, which merge to form the optic chiasm Optic chiasm divides into optic tracts Optic tracts travel to thalamus and then to occipital lobe Cranial Nerve III: Oculomotor Motor (mostly) - Moves eyes Accommodation of lens for near vision Constriction of the iris in response to light Sensory proprioceptive information from the eyes Cranial Nerve IV: Trochlear Motor (mostly) - Moves eyes Only cranial nerve arising from posterior brain stem and crossing midline after leaving brain stem Eye movements Sensory proprioceptive impulses from eyes Cranial Nerve V: Trigeminal Both - Chews food; feels front of head Largest cranial nerve Forms three branches - Ophthalmic, Maxillary & Mandibular Sensory info: touch, pain, temp from face Motor information for chewing muscles Cranial Nerve VI: Abducens