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CN exits from skull
| Question | Answer |
|---|---|
| Cribriform Plate | Olfactory N (CN I) |
| Optic Foramen | Optic N (CN II) |
| Superior Orbital Fissure | 1. Oculomotor N (CN III). 2. Trochlear N (CN IV). 3. Abducens N (CN VI). **4. Opthalmic division (V1)** |
| Foramen Rotundum | Maxillary division (V2) |
| Foramen Ovale | Mandibular division (V3) |
| Internal Auditory Meatus | 1.Facial N (CN VII) 2.Vestibulocohclear N (CN VIII). |
| Jugular Foramen | 1.Glossopharyngeal N (CN IX). 2.Vagus N (CN X). 3.Spinal Accessory N (CN XI) |
| Hypoglossal canal | Hypoglossal N (CN XII) |
| 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. |
| 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) |
| External Nasal N | Terminal branch of the anterior ethmoidal N. It is a cutaneous sensory nerve of external nose. |
| 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 |
| 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 |
| Origin of CN I | Telencephalon |
| Origin of CN II | Diencephalon, inferior to hypothalamus |
| Origin of CN III | Anterior Midbrain, between cerebral peduncles |
| Origin of CN IV | Dorsal Midbrain |
| Origin of CN V | Lateral Pons |
| Origin of CN VI | Anterior Ponto-medulary junciton |
| Origin of CN VII | Lateral pontomedulary junction |
| Origin of CN VIII | inferoposterior to CN VII |
| Origin of of CN IX | Medulla - lateral sulcus |
| Origin of CN X | Posterolateral sulcus of Medulla |
| Origin of CN XI | Cranial and spinal roots through the foramen magnum. |
| Origin of CN XII | Medulla, lnferior to CN X (sulcus between inferior olive and pyramid) |
Created by:
WeeG
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