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Overview of Cranial Nerves

An overview to help learn things by heart for the 1st year anatomy exam at Cambridge medical school.

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Overview of Cranial Nerves

  1. 1. Nerve Exits Skull Branches Branchial Somatic Somatic Special Visceral Parasympathetic Defects/Test motor motor sensory sensory sensory (not complete)I Olfactory Cribriform plate Smell No smellII Optic (from retinal cells) Optic canal 2branchescross @chiasm Sight See separate notesIII Oculomotor Superior orbital Superior and inferior LPS s rectus Ciliary m. and Complete: ptosis and fissure division (carries (sup division) sphincter pupillae via laterally deviated eye parasymp) m,i recti ciliary ganglion and with dilated pupil (no inf. oblique short ciliary nerves Va parasymp.)IV Trochlear Superior orbital Sup. oblique Can’t look in and fissure down Opthalmic division of Superior orbital Frontal, lacrimal, Forehead and nose,Va trigeminal fissure nasociliary: long, short, meninges ant ethm, infratrochlear Maxillary division of Foramen Zygomatic, infraorbital, Cheeks to upper lip, Loss of sensation,Vb trigeminal rotundum nasopalatine, greater/ external surface of shingles, jaw deviates lesser palatine, pharyng. tympanic membrane to weak side when Mandibular division of Foramen ovale Ant to muscles, post: 1st arch muscles of Lower lip and jaw opening mouthVc trigeminal lingual, inf alveolar, mastication plus auriculotemporal MATTVI Abducent Superior orbital Lat. rectus Eye deviates med fissure when looking laterallyVII Facial Int. auditory - Greater petrosal 2nd arch Ear and tympanic Taste to ant Lacrimal and hayfever Loss of taste to ant. (motor root and nervous meatus - chorda tympani muscles of facial membrane 2/3 of tongue glands via 2/3 of tongue, muscles intermedius) Motor fibres - n. to stapedius expression plus pterigopalatine of facial expression, exit via - n. to post digastric, POSS ganglion, sublingual Bell’s palsy stylomastoid occl, stylohyoid and submandibular foramen - temporal, zygomatic, glands via buccal, mandibular, submandibular cervical (from parotid) ganglionVIII Vestibulocochlear Int. auditory Hearing, Hearing and balance meatus Balance impairedIX Glossopharyngeal Jugular foramen Lesser petrosal, to 3rd arch stylo- Sensation to Taste to post Parotid gland via otic Function of carotid stylopharyngeus, pharyngeus posterior 1/3 of 1/3 of tongue ganglion baroreceptors sensory, taste and to tongue, int. surface impaired, no gag carotid sinus and body of tymp. membrane reflexX Vagus Jugular foramen Pharyngeal, internal and 4th arch sup. External ear Pharynx, Neck, thorax, Deviation of uvula external superior laryngeal = crico- larynx, abdomen towards normal side laryngeal, recurrent thyroid, pharynx- viscera laryngeal, cardiac, geal plexus = m. left/right = ant/post of the palate and vagus pharynx, 6th arch rec. laryngealXI Accessory Jugular foramen Spinal and cranial root Spinal root: Can’t turn head or sternocleido- shrug shoulders mastoid, trapezius, cranial root to XXII Hypoglossal Hypoglossal To tongue and ansa Muscles of Tongue deviates canal cervicalis (geniohyoid tongue exc. towards lesion and thyrohyoid) palato-glossus (pharyngeal plexus)Yellow: special sensory, orange: branchial motor, blue: somatic motor