2.5
Cranial Nerves
| CN I | Olfactory |
| CN II | Optic |
| CN III | Oculomotor |
| CN IV | Trochlear |
| CN V | Trigeminal |
| CN VI | Abducens |
| CN VII | Facial |
| CN VIII | Vestibulocochlear |
| CN IX | Glossopharyngeal |
| CN X | Vagus |
| CN XI | Spinal Accessory |
| CN XII | Hypoglossal |
CN I (Olfactory)
- Traverses the cribriform plate of the ethmoid bone
- Special Sensory
- Smell
CN II (Optic)
- Traverses the optic foramen of the sphenoid bone
- Special Sensory
- Vision
CN III (Oculomotor)
- Originates in the midbrain
- Traverses the superior orbital fissure of the sphenoid bone
- Motor
- Eye movement
- Superior rectus m.
- Inferior rectus m.
- Medial rectus m.
- Inferior oblique m.
- Pupillary constriction
- Circular m.
- Pupillary accommodation
- Ciliary m.
- Raises eyelid
- Levator palpebrae superioris m.
- Eye movement
CN IV (Trochlear)
- Originates in the midbrain
- Traverses the superior orbital fissure of the sphenoid bone
- Motor
- Eye movement down and abducted
- Superior oblique m.
- Eye movement down and abducted
CN V (Trigeminal)
- Originates in the midbrain, pons, and medulla
- Forms the trigeminal ganglion
- Diverges into Three Branches: (Figure 2.5)
- Ophthalmic branch (V1)
- Maxillary branch (V2)
- Mandibular branch (V3)
Ophthalmic Branch (V1)
- Traverses the superior orbital fissure of the sphenoid
- Sensory
- Eye
- Scalp
- Forehead
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