Anatomy of the eyes Flashcards
what goes out through the surpaorbital notch
the supraorbital nerve
where do most fractures of the orbit occur and what bone is broken
medial wall (lacrimal bone)
What are the main structures of the eyeball?
Sclera
Cornea
Uvea (cilliary body, iris and choroid)
Retina
how are collagen fibres organised in the cornea?
in lamellae (destructive interference)
how are collagen fibres organised in the sclera?
in swirls (fibres not uniform)
is the cornea avascular?
yes
what layer of the cornea if damages produces a scar?
layer 3, stromal
What is the anterior chamber filled with?
Aqueous Humour
at what site does the fluid exits the anterior chamber?
at the anterior angle
what is the pathway for getting rid of the AHumour in the anterior chamber?
Trabecullar Meshwork - Canal of Schlemn (@anterior angle) - Venous System
what are the main muscles of the iris?
Sphincter (Parasympa CN3)
Dilator (Sympa)
MAin parts of the cilliary body?
Ciliary Muscle
Ciliary Epithelium
Ciliary Process
What part of the ciliary body produces the aqueous humour?
the ciliary epithelium
Accomodation of the lens due to —–1—- activity happens in order to see objects that are —-2— and causes relaxation of the —–3—- with —–4—- of the lens
1 Parasympathetic
2 Close
3 Zonules
4 Fattening
What is presbyopia?
inability that develops with age to accomodate the lens of the eye because the capsule of it looses flexibility and alzo de zonules
requires (+) glasses
Where does the main supply to the retina closer to the choroid come from?
the choriocapillaries
the choriocapillaries is majorly supplied by the
posterior retinal arteries
lamina cribosa is a mesh of collagen fibres that come from the sclera
T, if IOP increases might damage the optic fibres that become the optic nerve due to them having to pass through the holes of the mesh
what is the foveal and what is it surrounded by
area of best visual acuity surrounded by the macula (no rods)
the macula is highly vascularised T/F
F obtains nutrients from the choroid
Blood supply of the eye comes mainly off
(Anterior, Short and long Posterior Ciliary Arteries) <– Internal Carotid Artery
the long ciliary arteries supply mainly
the photoreceptors away from the optic nerve, the iris and the ciliary body (they travel between the sclera and the choroid)
the anterior ciliary Arteries supplies mainly the
conjunctiva
what are the main muscles of the eyelid?
Open: Levator Palpebrae Superioris (CN 3)
Close: Orbicularis Oculi (CN 7)
