CN 3,4,6 and eye movements

Question 1

relationship of CN 3 to posterior cerebral and superior cerebellar arteries?

relationship of CN 3 to posterior communicating and internal carotid artery?

Mickey’s face:

ears?

eyes?

nose?

chin?

Answer 1

CN3 passes btw posterior cerebral and superoir cerebellar arteries

CN3 travels alongside post. communicating artery and underneath internal carotid artery

mickey’s face:

ears - cerebral peduncles and substantia nigra

eyes - red nuclei

nose - periaqueductal gray and cerebral aqueduct of Sylvius

chin - superior colliculi

Question 2

what can cause cavernous sinus sydrome?

Answer 2

hemorrhage, tumors

infections, inflammatory diseases such as Tolosa-Hunt syndrome

Question 3

contents of cavernous sinus?

Answer 3

CN 3,4, 5.1, 5.2, 6, internal carotid artery

Question 4

what innervates the tarsal muscle? what does this cause?

Answer 4

sympathetic innervation—>provides autonomic innervation of the eyelid

Question 5

pupil constrictor and ciliary muscles innervated by?

function of ciliary muscle?

Answer 5

parasympathetic innervation

ciliary muscle - produces change in lens shape as the eyes are converged(accomodation reflex)