Eye anatomy Flashcards
What is the vitreous chamber (posterior cavity) filled with?
Vitreous humour
Where is the anterior chamber
Between the cornea and the iris
Where is the posterior chamber
Between the lens and the iris
What are the chambers filled with
Aqueous humour
Purpose of aqueous humour
Supplies nutrients to the anterior cavity components
Where is aqueous humour produced?
Produced by the capillary network within the ciliary body
Where does the aqueous humour flow from?
Flows from the ciliary body, around the lens and under the iris, through the anterior chamber, through the trabecular meshwork and into the canal of Schlemm.
From the canal of Schlemm it eventually enters the general circulation.
Macula layers
Choroid layer
Bruch’s membrane
Retinal pigment epithelium
Photoreceptors
Choroid layer
Contains blood vessels that provide the blood supply to the macula
Role of iris
Pigmented layer that colours the eyes
Controls size of pupil
Primary refractive structures
Bend incoming light to focus the image on the retina
- Lens
- Cornea
Uvea componenets
Iris - anterior
Ciliary body - intermediate
Choroid - posterior
Fovea
Aspect of retina which contains only cone cells
Walls of eyeball
- Fibrous sclera and cornea
- Uvea
- Retina
Purpose of retina
Contains rods and cone cells
Suspensory ligaments
Connect the ciliary body to the lens
Role of ciliary body
Controls shape of lens
Produces aqueous humour
What separates the anterior and posterior cavity
Lens
Parts of the anterior cavity
Anterior and posterior chamber
2 muscles in the iris
Sphincter muscles
Dilator muscles
Innervation to the muscles in the iris
Sphincter muscles - parasympathetic - constriction
Dilator muscles - sympathetic - dilation
Lens
Elastic structure consisting of transient fibres
Accommodation
Ability to adjust the strength of the lens - constriction/ dilation dependent of ciliary muscles
Near source accommodation
Parasympathetic nerve causes the ciliary muscles to constrict using the sphincter muscles which tightens the lens and causes light to refract more
Cornea
Anterior aspect of the sclera that covers the iris
Transparent layer
Controls light refraction
Pupil
Gap in the lens that controls the amount of light entering the eye to the retina
Sclera
Outer most structure of eye, keeps shape and protects eye
Optic nerve
Optic fibres coalesce at the optic disc to form the optic nerve
Retina
Where the rod cells and cone cells lie, converts light into action potentials to transmit via the optic nerve
What lies behind the orbit
ICA
What lies directly superior to the frontal sinus
Frontal lobe
Where does the lacrimal glands sit
Lacrimal groove
What does the lacrimal sac do
Drain tears into the inferior turbinate
