Brain Vasculature and CNs Flashcards
where does the brain get its blood supply?
80% internal carotid arteries
20% vertebral arteries
after ascending to the brain, the internal carotid arteries split into >
the anterior and middle cerebral arteries
anterior cerebral arteries supply blood to
medial, frontal, parietal lobes
anterior cerebral arteries are connected by
anterior communicating artery
middle cerebral arteries supply blood to
lateral surface of cerebral hemispheres
before splitting into ant and middle cerebral arteries, the internal carotid arteries give rise to..
anterior choroidal arteries
posterior communicating arteries
what connects the internal carotid arteries to posterior cerebral arteries
posterior communicating arteries
the vertebral arties give rise to
post inf cerebellar arteries
post inf cerebellar arteries supply what and give rise to what
supply inf surface of cerebellum
give rise to post spinal arteries (supply post spinal cord)
the ant spinal artery branches off of what
vertebral arteries
the two vertebral arteries come together to form what, which gives rise to what
basilar artery > ant inf + sup cerebellar arteries
at the level of the midbrain, the basilar artery splits into what
two post cerebral arteries
posterior cerebral arteries supply blood to
medial and inferior surfaces of occipital and temporal lobes
what arteries form the circle of willis
ant cerebral
post cerebral
internal carotid
what benefit does the circle of willis offer
allow blood flow to continue if a major vessel is blocked on one side of the brain
CN I
olfactory
cribiform plate
sensory
smelling
CN II
optic
optic canal
sensory
vision
CN III
oculomotor
superior orbital fissure
motor
eye movement, pupil constriction
CN IV (4)
trochlear
superior orbital fissure
motor
sup oblique eye muscles - abduct, depress, int rotate eyes (cross eye)
CN V (5)
trigeminal
- opthalmic - sup orbital fissure (sensation to scalp, forehead, nose)
- maxillary - foramen rotundum (sensation to cheeks, eyelid, nasal mucosa, upper lip, palate
- mandibular - foramen ovale (sensation and motor function to ant 2/3 of tongue, skin over mandible, lower teeth, muscles of mastication)
CN VI (6)
abducens
superior orbital fissure
motor
controls lateral rectus (lateral away from midline/nose)
CN VII (7)
facial
internal acoustic meatus
sensation to part of ear, taste from ant tongue, mucus glands, motor function of the face
CN VIII (8)
vestibulocochlear
internal acoustic meatus
sensory - hearing and balance
CN IX (9)
glossopharyngeal
jugular foramen
post 1/3 of tongue sensation and taste, external ear, middle ear, carotid body of sinus, motor to parotid gland and stylopharyngeus
