What are the 3 classifications for cranial nerves?
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The cranial nerves that are attached to the medulla oblongata are the glossopharyngeal, vagus, accessory and hypoglossal nerves. The glossopharyngeal nerve is the ninth crania…l nerve that causes the tongue, throat, and parotid gland to function properly. The vagus nerve is the tenth cranial nerve which helps with motor production, mainly regarding the process of voice production. The accessory nerve is the eleventh cranial muscle whose only function is motor function, mainly regarding the trapezius and sternocledomastoid muscles. Lastly, the hypoglossal nerve is the twelfth cranial nerve which helps in the proper functioning of the muscles under the tongue. (MORE)
The Optic Nerve (one of the Cranial Nerves) is enclosed by three sheaths that are continuous with the three layers of cranial meninges (dura, arachnoid, and pia). The central …artery and vein of the retina pass through these meningeal sheaths and are included in the distal part of the optic nerve. (MORE)
here's a useful mnemonic that I used in medical school: 1. Some - olfactory (sensory)2. Say - optic (sensory)3. Marry - oculomotor (motor)4. Money - trochlear (motor)5. But - …trigeminal (both)6. My - abducens (motor)7. Brother - facial (both)8. Says - vestibulocholear (sensory)9. Big - glossopharyngeal (both)10. Boobs - vagus (both)11. Matter - accessory (motor)12. More - hypoglossal (motor) (MORE)
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It is not one of the cranial nerves (I-XII), it is cervical nerve number 6.
The 8th cranial nerve is called the Vestibulocochlear nerve consisting of 2 branches --- the cochlear branch (hearing portion) and the vestibular branch (equilibrium portion).
#NameSensory, Motor or BothOriginNucleiFunction0Cranial nerve zero (CN0 is not traditionally recognized.)Sensoryolfactory trigone, medial olfactory gyrus, and lamina term…inalisStill controversialNew research indicates CN0 may play a role in the detection of pheromones IOlfactory nervePurely SensoryAnterior olfactory nucleusTransmits the sense of smell; Located in olfactory foramina of ethmoidIIOptic nervePurely SensoryGanglion cells of retinaTransmits visual information to the brain; Located in optic canalIIIOculomotor nerveMainly MotorMidbrainOculomotor nucleus, Edinger-Westphal nucleusInnervates levator palpebrae superioris, superior rectus, medial rectus, inferior rectus, and inferior oblique, which collectively perform most eye movements; Located in superior orbital fissureIVTrochlear nerveMainly MotorMidbrainTrochlear nucleusInnervates the superior oblique muscle, which depresses, rotates laterally (around the optic axis), and intorts the eyeball; Located in superior orbital fissureVTrigeminal nerveBoth Sensory and MotorPonsPrincipal sensory trigeminal nucleus, Spinal trigeminal nucleus, Mesencephalic trigeminal nucleus, Trigeminal motor nucleusReceives sensation from the face and innervates the muscles of mastication; Located in superior orbital fissure (ophthalmic nerve - V1), foramen rotundum (maxillary nerve - V2), and foramen ovale (mandibular nerve - V3)VIAbducens nerveMainly MotorPosterior margin of PonsAbducens nucleusInnervates the lateral rectus, which abducts the eye; Located in superior orbital fissureVIIFacial nerveBoth Sensory and MotorPons (cerebellopontine angle) above oliveFacial nucleus, Solitary nucleus, Superior salivary nucleusProvides motor innervation to the muscles of facial expression, posterior belly of the digastric muscle, and stapedius muscle, receives the special sense of taste from the anterior 2/3 of the tongue, and provides secretomotor innervation to the salivary glands (except parotid) and the lacrimal gland; Located and runs through internal acoustic canal to facial canal and exits at stylomastoid foramenVIIIVestibulocochlear nerve (or auditory-vestibular nerve or statoacoustic nerve)Mostly sensoryLateral to CN VII (cerebellopontine angle)Vestibular nuclei, Cochlear nucleiSenses sound, rotation and gravity (essential for balance & movement). More specifically. the vestibular branch carries impulses for equilibrium and the cochlear branch carries impulses for hearing.; Located in internal acoustic canalIXGlossopharyngeal nerveBoth Sensory and MotorMedullaNucleus ambiguus, Inferior salivary nucleus, Solitary nucleusReceives taste from the posterior 1/3 of the tongue, provides secretomotor innervation to the parotid gland, and provides motor innervation to the stylopharyngeus (essential for tactile, pain, and thermal sensation). Some sensation is also relayed to the brain from the palatine tonsils. Sensation is relayed to opposite thalamus and some hypothalamic nuclei. Located in jugular foramenXVagus nerveBoth Sensory and MotorPosterolateral sulcus of MedullaNucleus ambiguus, Dorsal motor vagal nucleus, Solitary nucleusSupplies branchiomotor innervation to most laryngeal and all pharyngeal muscles (except the stylopharyngeus, which is innervated by the glossopharyngeal); provides parasympathetic fibers to nearly all thoracic and abdominal viscera down to the splenic flexure; and receives the special sense of taste from the epiglottis. A major function: controls muscles for voice and resonance and the soft palate. Symptoms of damage: dysphagia (swallowing problems), velopharyngeal insufficiency. Located in jugular foramenXIAccessory nerve (or cranial accessory nerve or spinal accessory nerve)Mainly MotorCranial and Spinal RootsNucleus ambiguus, Spinal accessory nucleusControls sternocleidomastoid and trapezius muscles, overlaps with functions of the vagus. Examples of symptoms of damage: inability to shrug, weak head movement; Located in jugular foramenXIIHypoglossal nerveMainly MotorMedullaHypoglossal nucleusProvides motor innervation to the muscles of the tongue (except for the palatoglossus, which is innervated by the vagus) and other glossal muscles. Important for swallowing (bolus formation) and speech articulation. Located in hypoglossal canal (MORE)