7. Cranial nerves
12 cranial nerves part of PNS
1. Olfactory (I)
2. Optic(II)
3. Oculomotor(III)
4. Trochlear(IV)
5. Trigeminal(V)
6. Abducent (VI)
7. Facial (VII)
8. Vestibulocochlear(VIII)
9. Glossopharyngeal(IX)
10. Vagus(X)
11. Accessory(XI) this not originate from brain
12. Hypoglossal (XII)
8. Cranial nerves
Special sensory
1. Hearing
2. Seeing
3. Smelling
4. Balancing
5. Testing
Special motor
• Innervate skeletal muscle derived embryological from
the pharyngeal arches and not from somite
9. Cranial nerves
Embryologically six pharyngeal arches
5th pharyngeal arch never develops
Each pharyngeal arch that does develop is
associated with a developing cranial nerve or a
branch
Cranial nerve carry efferent fibers that innervate
the musculature from pharyngeal arch