Eye Flashcards
- Eyebrow
- Orbicularis Oculi Muscle
- Conjunctiva over eye
- Conjunctiva of eyelid
- Tarsal Gland
- Tarsal Plate
- Cornea
- Eyelash
- Skin
- Loose Connective Tissue
- Orbicularis oculi muscle
- Tarsal Plate
- Conjunctiva of lower eyelid
- ?
- ?
- ?
Tears’ Route
Tears are produced in the lacrimal gland superior lateral to the eye.
The secretion passes though multiple ducts onto the cornea
The Tears are collected by superior and inferior Lacrimal Canaliculi on the medial side of the eye.
These pass down the nasolacrimal duct into the nasal cavity.
Layers of the eye
3
- Sclera
- Choroid
- Retina
- anteriorly: cornea and conjunctiva
Eye Chambers
(3)
- Anterior (aqueous humour)
- Posterior (Aqueous Humour)
- Vitreous Humour chamber
Intrinsic eye muscles and innervations
Constrictor Pupillae (sphincter) supplied by oculomotor parasympathetics to ciliary ganglion
Dilator Pupillae Postganglionics from superior cervical ganglion (by way of the Carotid plexus), which recieves fibers rom the top of the sympathetic chain.
Blood supply of eye
Central Atery of retina, from the ophthalmic branch of the internal carotid.
Ptosis:
What and how?
- Opening eyes
- Levator Palpebrae Superioris
- CN3 and sympathetic nerves.
Eye Development
6
- The Lateral Prosencephalon produces lateral bud tubercules called optic vesicles
- The optic vesicles contact the ectoderm and induce the formation of a lens placode.
- The Optic vesicle spreads around the lens plactode until they can be termed “lens cup” and “optic cup”
- The Lens Cup is separated from the rest of the ectoderm by the advancing vesicle, whose cells are differentiating into those of pigmented and neural retina.
- The separated lens vesicle induces the cornea.
- Neural crest derived mesenchyme produces the sclera and choroid
Lesion of the Optic vesicle during developent means
No eye develops.
The Optic canal carries
The optic nerve
Central artery of retina
Central retinal vein
Eye layers, inwards
- Sclera
- Choroid
- Retina
The Fovea
The Pit inside the Macula region
Chambers of the eye
The anterior Chamber is Filled with aqueous humour between the iris and cornea. The aqueous humor is drained by the canal of schlemm.
The Posterior Chamber is much smaller in volume: lying between the lens and ligaments. The Ciliary body continuously secretes aqueous humour to be drained into the anterior chamber by passing between the lens and iris.
The Large vitreous chamber is filled with vitreous humor / jelly.
Blockage of the canal of Schlemm
The Aqueous Humor cannot drain from the eye
The ciliary body continues to produce it
Pressure rises: Glaucoma.
If untreated, the retina and blood supply are damaged.
Suspensory ligaments
Are taught when the lens is broadest to accomodate distant objects.
Are loose when the Ciliary muscles press on the elastic lens to accomodate for close objects.
