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CN exits from skull

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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