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12 Cranial Nerves

Anatomy Mod. 3 - Head Neck

CN I OLFACTORY only has a special sensory fxn. of smell; no autonomic-parasymp. fxn. exits through the cribiform plate
CN II OPTIC only has a special sensory fxn. of vision; no autonomic-parasymp. fxn. exits the optic canal
CN III OCCULOMOTOR motor fxn. to 5 of the 7 extra-ocular eye muscles autonomic-parasymp. = pupil constriction & lens accommodation no general or special sensory fxn. exits the superior orbital fissure
CN IV TROCHLEAR motor fxn. to 1 out of the 7 extra-ocular no sensory (general or special), or autonomic-parasymp. fxn. exits the superior orbital fissure
CN V TRIGEMINAL 3 Branches Opthalmic Maxillary Mandibular
CN V Opthalmic Branch general sensory fxn. to the skin above the eyes (supraorbital n.) and the cornea exits the supraorbital fissure
CN V Maxillary Branch general sensory fxn. to the skin below the eyes to the lips (infraorbital n.), and the upper teeth exits the foramen rotundum
CN V Mandibular Branch motor fxn. to the muscles of mastication general sensory function to the skin below the lips (mental n.), lower teeth (inferior alveolar n.), and the anterior 2/3 of the tongue (lingual n.) exits the foramen ovale
CN VI ABDUCENS motor fxn. to 1 out of the 7 extra-ocular muscles exits the superior orbital fissure
CN VII FACIAL motor fxn. to muscles of expression gen. sensory to ear canal/auricle special sensory fxn. is taste: ant. 2/3 of tongue (chorda tympani) autonomic-parasymp. = lacrimal glands, submandibular & sublingual salivary glands exits int. acoustic meat
CN VIII VESTIBULOCOCHLEAR AKA-acoustic nerve special sensory fxn. to hearing & balance exits internal acoustic meatus
CN IX GLOSSOPHARYNGEAL supplies motor fxn. to the pharyngeal muscles general sensory to the wall of the pharynx & post. 1/3 of the tongue special sensory fxn. of taste to the post. 1/3 of tongue autonomic-parasymp = parotid salivary gland exits jugular for
CN X VAGUS supplies motor fxn. to the pharyngeal & laryngeal muscles general sensory supply to ear canal special sensory fxn. is taste: base of tongue autonomic-parasymp = thoracic & abdominal viscera exits jugular foramen
CN XI SPINAL ACCESSORY supplies motor fxn. to the trapezius & sternocleidomastoid muscles exits jugular foramen
CN XII HYPOGLOSSAL supplies motor fxn. to the muscles of the tongue exits the hypoglossal canal
CN I & II technically tracts of the brain
OOOTT(3)AFVGVAH Oh= Olfactory Oh= Optic Oh= Oculomotor To= Trochlear Touch= Trigeminal (Opthalmic, Maxillary, Mandibular) And= Abducens Feel= Facial Very= Vestibulocochlear (acoustic) Good= Glossopharyngeal Vegetables= Vagus A= Accessory (spinal) H= Hypoglossa
Sensory versus Motor Some = I Say = II Money = III Matters = IV But = V (all 3 branches) My = VI Brother = VII Says = VIII Big = IX Brains = X Matter = XI Most = XII
CN with Motor Function supply skeletal/voluntary muscles of head have neuronal cell bodies located in the brainstem nuclei are within the brainstem (motor nucleus of CN VII, a discrete cluster or aggregation of motor neurons; NOT continuous with others
CN with Sensory Function nerves that supply sensory info coming from the skin in and around the head have neuronal cell bodies located in the ganglia outside the CNS (i.e. 5th CN ganglia, 7th CN ganglia) some do have particular names, but typically it's described as a number
CN with Autonomic Function some CN have autonomic function CNs III, VII, IX, X this autonomic function is parasympathetic because CNs only carry parasympathetic nerve fibers (i.e. the glands in and around the head -- tear glands, salivary glands, mucous glands
Created by: kmaresco



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