8.1 Cranial Nerves III, V and VII Flashcards
Where does the oculomotor nerve originate from?
Anterior midbrain
Which two arteries does the oculomotor nerve pass through as it leaves the brain?
Inferior to cerebral artery
Superior to superior cerebellar artery
Which layer does the oculomotor nerve pierce to enter the cavernous sinus?
Dura mata
Via which fossa does the oculomotor nerve exit the cranial fossa?
Superior orbital fissure
Name the 2 structures that the superior branch of the oculomotor nerve innervates
Superior rectus muscle
Levator palpabrae superioris muscle
Sympathetic- superior tarsal muscle
Name the 2 structures that the inferior branch of the oculomotor nerve innervates
Inferior rectus
Medial rectus
Inferior oblique
Parasympathetic- sphincter pupillae + ciliary muscles
Where does the trigeminal nerve originate from?
3 sensory nuclei and 1 motor nucleus from the midbrain to the medulla
Where does the sensory root of the trigeminal nerve form?
At the level of the Pons
When does the sensory root become the trigeminal ganglion?
Middle cranial fossa, lateral to the cavernous sinus
To which branch of the trigeminal nerve is the motor root distributed to?
V3- mandibular nerve
Name the 3 branches of the trigeminal nerve
V1- opthalmic
V2- maxillary
V3- mandibular
Where does the ophthalmic nerve exit the cranial cavity?
Superior orbital fissure
Where does the maxillary nerve exit the cranial cavity?
Foramen rotundum
Where does the mandibular nerve exit the cranial cavity?
Foramen ovale –> Infra-temporal fossa
What are the 3 branches of the ophthalmic nerve?
Frontal
Lacrimal
Nasocilary