Eye and Orbit Flashcards
what nerve gives sensory to skin over parotid duct
auriculotemporal of V3
what nerve passes through foramen rotundum
V2
what carries postgang psy fibers to parotid gland?
auriculotemporal of V3
what innervates occipitalis m.?
posterior auricular branch of facial nerve (VII)
which cranial nerves contain GVE fibers
III, VII, IX (otic ganglion) , X
do we have drgs for cranial nerves?
no
innervation path for parotid
CNIX exit jugular foramen, tympanic branch goes back up through the tympanic canaliculi to middle ear and form a plexus. part of those are sensory to the middle ear, but the ones we want go up through the roof of middle ear (tegman tympani) they cross the middle cranial fossa as the lesser petrosal nerve. it goes down through foramen ovale and synapse in otic ganglion
what bone is the origin of the levator anguli oris
maxilla
what bone contains stylomastoid f.
temporal
which bone has the groove for lesser petrosal n.
temporal
what CN that innervate the face contain SVE fibers
CN V3 (muscles of mastication. nerve of first pharyngial arch), VII (muscles of facial expression. nerve of second pharyngial arch)
which blood vessel most often impinges on CN V to cause trigeminal neuralgia?
superior cerebellar a.
are we gonna study visual pathways?
nope. just anatomy of the eye, no retina
where do eye boogies get stuck?
medial angle of the eye in lacrimal caruncle and lacrimal lake. maybe semilunar conjunctival fold if its a big one .
what bones are in the medial angle of the orbit?
lacrimal bone (with lacrimal groove), orbital plate of ethmoid bone, tiny piece of palatine bone, orbital surface of maxilla
what nerves are intimately related to the orbit
V1, V2, III
what bone parts make the superior orbital fissure?
greater and lesser wings of sphenoid
what bone parts make the inferior orbital fissure?
greater wing of sphenoid and orbital surface of maxilla (which has a groove for V2)
what sinus lies on either side of the body of sphenoid
cavernous sinus (for blood)
what are some foramina that are totally within the sphenoid?
foramen rotundum, pterygoid canal, foramen ovale, foramen spinosum
how does the central artery of retina get to the eye?
it travels WITHIN the optic nerve
what does the tarsal plate do?
its like the skeleton of the upper and lower lid that attaches to the levator palpegrae superiorism,, superior tarsal m. (aka muellers muscle innervated by ANS)
what innervates levator palpebrae superioris m
superior branch of occulomotor (III)
what does the lacrimal gland wrap around?
tendon of levator palpebrae superioris
what walls off the anterior portion of the orbit from the outside world?
orbital septum (from periosteum of the bone). its on inferior and superior portions of the orbit
lacrimal nerve is from which cranial nerve
V1,
what is the conjunctival fornix?
where the conjunctiva from the eyelid and eyeball meet
how does a tear get to your nose?
punctiva to canaliculi
PSy of CN __ innervate the lacrimal gland. How?
VII. go to internal acoustic meatus thru geniculate ganglion (NO SYNAPSE). thru foramen for greater petrosal nerve. it meets up with deep petrosal nerve (postganglionic sy) to pterygopalatine ganglion. SYNAPSE HERE. up to V2 to zygomatic n. to lacrimal n to lacrimal gland
what are the three parts of the globe?
sclera, choroid, and neuronal layer (retina, which we don’t care about yet)
what muscle changes the shape of the lens?
ciliary muscle via zonular fibers. it attaches to the lens CAPSULE, not the actual lens
what two things related to the eye are from the CNS?
retina (from optic cup) and optic nerve (from optic stalk)
what germ layer makes the lens?
ectoderm
what germ layer does the rest of the eyeball come from
mesoderm
t/f sclera and cornea are the same layer
true
what layer has the ciliary process and iris?
choroid layer
what attaches the lens to the back of the eye?
hyaloid canal
dialator muscle is psy or sy control?
sy.
what does the fascia of ocular muscles attach to?
check ligaments go to the bone of orbit, otherwise they attach to the sclera
what is the space between the fascia of ocular muscles and the fascial sheath of eyeball?
episcleral space
____ mm. come from a common tendinous sheath behind the eye
rectus muscles
what five nerves go through the common tendinous ring?
oculomotor sup. div. (III), nasociliary n, abducent (VI), oculomotor inf. div (III), optic nerve (II)
when you have someone look at your finger, what nerves are you testing?
III, IV, VI
what do short ciliary nerves do
go to the ciliary muscles
what CN goes to lateral rectus?
abducens CN VI
all the branches of V1 are ____
sensory
nasociliary nerve is a branch of ___
opthalmic branch of V1
trochlear nerve goes to ____
superior oblique m
superior division of oculomotor innervates?
levator palpebrae superioris, superior rectus m
what are post ganglionic sympatheic nerves going to do in the eye?
diallator pupillae, and intraocular blood vessels
what are post synaptic parasympathetic fibers gonna do?
sphincter pupilllae
short ciliary nerve contains what types of nerve fibers
postsynap. psymp, postsynap symp, and general sensory fibers
arteries to eye are from?
opthalmic artery off the ICA
veins from eye go?
to angular vein or to cavernous sinus or to pterygoid plexus. look at this picture because theres a lot
infratrochlear n is the terminal branch of?
nasociliary n.
external nasal n is terminal branch of?
anterior ethmoidal n.
horners syndrom is?
ptosis of muellers muscle
if you shine a light in the eye and neither eye responds, what is the problem?
the afferents are not getting the signal back
ciliary ganglion lies on the __ side of the optic nerve
lateral
if you get a baseball to the eye, what kind of fracture can you get?
blowout fracture
do you replace a lens for glaucoma?
uhh. NO.
when would one get conjunctival petichiae?
strangulation
