Cranial nerves
Twelve nerve pairs, called cranial nerves, project from the brain.
Each nerve has a specific name and is designated by a Roman numeral.
Names of cranial nerves
1. Olfactory nerve
2. Optic nerve
3. Oculomotor nerve
4. Trochlear nerve
5. Trigeminal nerve
6. Abducent nerve
7. Facial nerve
8. Vestibulocochlear nerve
9. Glossopharyngeal nerve
10. Vagus nerve
11. Accessory nerve
12. Hypoglossal nerve
Classification of cranial nerves
Sensory cranial nerves: contain only afferent (sensory) fibers
1- Olfactory nerve
2- Optic nerve
8- Vestibulocochlear nerve
Motor cranial nerves: contain only efferent (motor) fibers
3- Oculomotor nerve
4- Trochlear nerve
6- Abducent nerve
11- Accessory nerve
12- Hypoglossal nerve
Mixed nerves: contain both sensory and motor fibers---
5- Trigeminal nerve,
7- Facial nerve,
9- Glossopharyngeal nerve
10- Vagus nerve
CN I Olfactory Nerve
CN II Optic Nerve
CN III Oculomotor Nerve
CN IV Trochlear Nerve
CN V Trigeminal Nerve
divisions of the trigeminal nerve
ophthalmic nerve (ophthalmic division [V1])
leaves the cranial cavity, and enters the orbit through the superior orbital fissure.
maxillary nerve (maxillary division [V2])
leaves the cranial cavity through the foramen rotundum, and enters the pterygopalatine fossa.
mandibular nerve (mandibular division [V3]).
leaves the skull through the foramen ovale.
CN VI Abducent Nerve
CN VII Facial Nerve
CN VIII Vestibulo-cochlear Nerve
CN IX Glosso-pharyngeal Nerve
CN X Vagus Nerve
CN XI Accessory Nerve
CN XII Hypoglossal Nerve
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