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40 Cards in this Set
- Front
- Back
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sclera
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dense fibrous connective tissue
forms posterior 5/6th of outer layer insertion for xtraocular muscles "white" of the eye |
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cornea
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anterior 1/6th if the outer layer
forms the transparent portion of eye |
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conjunctiva
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thin, transparent epithelial membrane
fused to the cornea |
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bulbar conjunctiva
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where conjunctiva is fused to the cornea
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palebral conjunctiva
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place where conjunctiva reflects onto the deep surface of the eyelid
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conjunctival fornix
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the reflection from bulbar to palebral layer
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uvea
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middle layer of the eye
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components of uvea
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choroid
ciliary body iris |
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choroid
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true middle layer of the uvea wall
provides path for blood vessels |
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ciliary body
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forms a ring at the corneoscleral junction
contains the cilliary muscle with fibres that have a circular orientation |
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cilliary muscle
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controls the tension exerted on the lens through the suspensory ligament
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suspensory ligament
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attaches the periphery of the lens to the inner margin of the cilliary body
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lens
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has an outer fibrous elastic capsule
natural shape is almost spherical |
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tenstion from intraocular pressure
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is exerted on the lens through the suspensory ligament
causes an inc in diameter and dec thickness of the lens |
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iris
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lies anterior to the ciliary body
contains pigment cells and 2 smooth muscles |
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pupil
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round central opening of the iris
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fibers of dilator pupillae muscle
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have a radial orientation and dilate the pupil under sympathetic stimulation
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fibers of constricter (sphincter) pupillae muscle
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have a concentric orientation and constrict the pupil under parasympathetic innervation via the oculomotor nerve
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Retina
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the inner layer of the eye
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nervous visual layer of the retina
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anterior
contains photoreceptors and bipolar primary affarent neurons |
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cones
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sensitive to higher intensity light
provide color vision |
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rods
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are sensitive to lower intensity light
black and white vision |
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macula lutea
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central area of the retina
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fovea centralis
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slight depression at the centre of the macula
no rods highest density of cones --- best visual acuity |
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optic disc
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medial to the fovea centralis
pt at which the axons of 2ndary afferents (ganglion cells) leave the retina to join the optic nerve |
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where retinal vessels enter the eye
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optic disc
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blind spot
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the optic disc since there are no photoreceptors here
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pigmented layer
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posterior layer of the retina
absorbs light rays after they have passed through the receptors in the visual layer |
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aqueous humor
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area anterior to cilliary body and lens
is filled with this produced by cilliary body no net reabso or production |
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vitreous humor/body
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area of the eye posterior to the cilliary body
contains gelatinous mass develops prenatally. |
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lacriminal gland
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lies in the superolateral aspect of the orbit posterior to the conjunctiva fonix
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lacrimanal gland secretion
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secreted via ducts in the conjunctiva
swept inferomedially across the eye |
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lacrimal puncta and lacrimal papillae
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secretions drain here at the apex of this.
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lacriminal canals
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lacriminal puncta opens via this into the lacriminal sac and the nasolacrimal duct
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nasolacriminal duct
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secretions from eye travel through canals to this, where they are drained into the nasal cavity.
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optic nerve
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carries 2ndary afferents from the retina towards the CNS
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optic chiasm
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axons from the nasal half of the each retina decussate here
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axons from the temporal half of the retina
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remain undecussated
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optic tract
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axons traveling from the retina travel through this on their way to the thalmus
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tertiary afferents of retina
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project to the primary visual cortex
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