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Block 12 Cranial nerves

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klau253's version from 2017-05-28 14:44

CN

Question Answer
Olfactoryno thalamic relay, olfactory tract --> lateral olfactory stria --> amygdala and hippocampus
Opticprojects to sup. collicus and pretectal nucleus in midbrain
Oculomotorinnervates sup. rectus, medial rectus, inf. rectus and inf. oblique, levator palpebrae superioris, sphincter pupillae, ciliary muscle
Parasym of oculomotorlens focusing and pupil constriction
Trochlearinnervates sup. oblique, exits brainstem dorsally
CN III, IV, VI and trigeminal V1 exit cranium viasup. orbital fissure **
CN III communicates with VI viamedial longitudinal fasciculus
memorize

 

Trigeminal
Question Answer
Ophthalmicsensory in forehead, exits thru sup. orbital fissure
Maxillarysensory in nose and upper teeth, exits thru foramen rotundum
Mandibularsenosry and motor, lower jaw, 2/3 of ant. tongue for sensory and muscles of mastication, exits via foramen ovale
memorize

 

Facial
Question Answer
Sensorytaste of ant. 2/3 of tongue
Motorfacial expression
Parasympatheticmotor fibres to lacrimal and salivary(submandibular and sublingual) glands
memorize

 

Vestibulocochlear
Question Answer
exits cranium viainternal acoustic meatus**
exit brainstem atpontomedullary junction
memorize

 

Glossopharyngeal
Question Answer
CN IX, X, XI, carotid artery and jugular vein all exit skull viajugular foramen**
Sensoryboth sense and taste of post. 1/3 of tongue, upper pharynx, tympanum, carotid body and sinus
motorstylopharyngeus muscle
Parasyminnervation to parotid gland
memorize

 

Vagus
Question Answer
Sensorythoracic and some abdominal viscera
Motorpharynx and larynx (swallowing and vocalisation)
Parasymheart, lungs and gut
memorize

 

Accessory
Question Answer
Motorsternocleidomastoid and trapezius
pathwayjoin with vagus nerve
weakenss in head turning suggests injury tocontralateral CN XI
unilateral shoulder weakness suggests injury toipsilateral CN XI
memorize

 

hypoglossal
Question Answer
emerges from medulla inpreolivary sulcus
exits cranium viahypoglossal canal
motorall tongue muscles except palatoglossus, articulation and speech
memorize