CN exits from skull
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| Cribriform Plate | Olfactory N (CN I)
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| Optic Foramen | Optic N (CN II)
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| Superior Orbital Fissure | 1. Oculomotor N (CN III).
2. Trochlear N (CN IV).
3. Abducens N (CN VI).
**4. Opthalmic division (V1)**
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| Foramen Rotundum | Maxillary division (V2)
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| Foramen Ovale | Mandibular division (V3)
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| Internal Auditory Meatus | 1.Facial N (CN VII)
2.Vestibulocohclear N (CN VIII).
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| Jugular Foramen | 1.Glossopharyngeal N (CN IX).
2.Vagus N (CN X).
3.Spinal Accessory N (CN XI)
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| Hypoglossal canal | Hypoglossal N (CN XII)
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| Branches of the Facial N (CN VII) | From superior innervation to inferior (Scalp to neck).
1.Poserior auricular.
2.Temporal.
3.Zygomatic.
4.Buccal.
5.Marginal Mandibular.
6.Cervical.
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| Cutaneous Branches of Opthalmic N (V1) | After entering the superior orbital fissure, it trifricates into:
1.Frontal N (bifricates into supra-orbital and supratrochlear N).
2.Nasociliary N (trifricates into Ant and Post ethmoidal N and infratrochlear N).
3.Lacrimal N (smallest)
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| External Nasal N | Terminal branch of the anterior ethmoidal N. It is a cutaneous sensory nerve of external nose.
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| Cutaneous Branches of Maxillary N (V2) | 1.Infra-orbital (Produces: Lateral nasal N, Superior labial N, and inferior palpebral N).
2.Zygomaticofacial N (prominence of the cheek).
3.Zygomaticotemporal N (Anterior temporal fossa).
**Superior alveolar (Ant, Mid, Post), Palatine (Greater/lesse
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| Cutaneous Branches of Mandibular N (V3) | 1.Auriculotemporal N (skin around the auricle and external aud. meatus).
2.Buccal N (Unites with buccal branch - facial N). 3.Mental N (emerges from the mental foramen to innervate the chin and lower lip).Other branches: Inf Alveolar, N to Mylohy, Lingua
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| Origin of CN I | Telencephalon
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| Origin of CN II | Diencephalon, inferior to hypothalamus
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| Origin of CN III | Anterior Midbrain, between cerebral peduncles
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| Origin of CN IV | Dorsal Midbrain
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| Origin of CN V | Lateral Pons
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| Origin of CN VI | Anterior Ponto-medulary junciton
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| Origin of CN VII | Lateral pontomedulary junction
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| Origin of CN VIII | inferoposterior to CN VII
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| Origin of of CN IX | Medulla - lateral sulcus
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| Origin of CN X | Posterolateral sulcus of Medulla
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| Origin of CN XI | Cranial and spinal roots through the foramen magnum.
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| Origin of CN XII | Medulla, lnferior to CN X (sulcus between inferior olive and pyramid)
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