The orbit and the eye Flashcards
what bone is the supraorbital notch in?
frontal
what bone is the infraorbital foramen in?
maxilla
what bone is the optic canal in and the superior orbital fissure in?
sphenoid
apex of the orbit?
optic canal
lateral wall of orbit?
sphenoid
medial wall of orbit?
ethmoid
roof of orbit?
frontal bone
floor of orbit?
maxilla
base of orbit?
orbital rim
the 2 parts of orbicularis oculi?
orbital part (above eye)
palpebrae part (below eye)
what is the limbus?
corneoscleral junction
what nerve controls lacrimal fluid production?
facial (parasympathetic part)
is the pupil under autonomic control?
yes
what 3 things make up the uvea?
iris
ciliary body
choroid
what are the 3 layers of the eye?
fibrous
uvea
retina
what are the 2 parts of the fibrous layer of the eye?
sclera and conrea
what attaches to the sclera
muscles
where is the anterior eye segment?
infront of the lens
where is the posterior eye segment?
behind the lens (bigger segment)
what segment is the anterior chamber in?
anterior segment (between cornea and iris)
what does the anterior chamber contain?
aqueous humour
what segment is the posterior chamber in>
anterior segment (between iris and suspensory ligaments)
also contains aqueous humour
what does the posterior segment contain?
vitreous humour (common place for floaters)
where is aqueous humour made and secreted from?
ciliary body
where does the aqueous humour travel to first after leaving ciliary body?
into posterior chamber to nourish the lens
where does aqueous humour go after the posterior chamber?
anterior chamber to nourish cornea
what happens to aqueous after being the anteerior chamber?
reabsorbed into scleral venous sinuses at iridocorneal angle
what does the fundus include?
optic disc
macula
fovea
where is your blind spot?
optic disc
where is the greatest density of cones?
macula
where is the fovea?
centre of macula
it is the area of most acute vision
name the layers of the retina anterior to posterior?
axons of ganglion cells
ganglion cells
photoreceptors
where do the retinal arteries and veins lie in relation to the retina?
they lie anterior to the retina
objectsin right visual field are processed by what part of primary visual cortex
left
objects in the left visual field are processed by what part of the primary visual cortex?
right
what artery branches from the internal carotid?
ophthalmic artery
what branches from the ophthalmic artery?
central artery of retina and
nasal branches (for littles area)
forehead branches
what veins drain the orbit/eye?
superior and inferior ophthalmic veins which drain to the cavernous sinus
how many extraocular muscles are there?
7
name thje extraocular muscles
superior rectus
inferior rectus
lateral rectus
medial rectus
superior oblique
inferior oblique
levator palpebrae superioris
what muscle lifts the upper eyelid?
levator palpebrae superioris
innervation of lateral rectus
abducent (CN VI)
innervation of superior oblique?
trochlear (CN IV)
what muscle innvervates all the muscles bar lateral rectus and superior oblique?
occulomotor! (CN III)
LR6 SO4 AO3
what does this mean?
lateral rectus -CN 6
superior oblique- CN 4
all others- CN3
what movement happens on the vertical axis?
abduction/adduction
what movement happens on transverse axis?
elevation/depression
what movement happens on anteroposterior axis?
intorsion/extorsion
what movement does superior oblique do?
down and out
