Flashcards in Anatomy Of The Eye Deck (61):
The peripheral organ of vision, is situated in a skeletal cavity, the orbit. 1inch in diameter and 8 grams in weight. Emebede in the orbital fat, separated from it by a thun fascial sheath.
Fascial sheath separting the eyeball from the orbital fat
Capsule of Tenon
Two cavities of the eyeball
Anterior cavity and posterior cavity
Further divided into anterior and posterior chambers due to the position of the iris
Contains the acqueous humour produced by ciliary process
Located behind the iris and contains the VITREOUS HUMOUR enclosed in hyaloid membrane
What are the layers of the eyeball?
Fibrous coat, Vascular coat, and Neural coat
Cosists of the scleraand cornea
Relatively hard consistency, is a dense layer which, when distended by intraocuoar pressure, maintains the shale of the eyeball.
External surface is white and smooth and is in contact with the inner surface of the fascial sheath of the eyeball.
Provides passage for nerves of the cornea and vascular autonomic nevrs and attached for extrinsic eye muscles.
It is the anterior, projecting trasnparent part of the external tunic, and its tear film cover is the major site of REFRACTION OF LIGHT entering the eye.
Cointains the Choroid, teh ciliary body, and the iris
Is a thin, highly vascular, dark brown tissue which lines almost the posterior 5/6 of the eye.
Pierced behind the optic nerve and is firmly adherent to the sclera.
Thicker posteriorly, and internally it si firmly attached to the retinal pigmented layer
Directly continuous with the choroid behind and with the iris in front. It shows a scalloped periphery where it is conituous with the choronoid and retina, termed the ORA SERRATA
Concerned with the susoension of the lens and with accomodation. It is also a majot source of aqueous fluid for the anterior segment of the eye
Is an adjustable diaphragm around a central aperture.
Concentration of these cells is the main factor determining the hue of the iris
This is a flat annulus of smooth muscle about 0.75mm wide and 0.15mm thick. It is densely packed fusiform myocytes are often arranged in small bundles and pass circumferentially around the pupil.
A thin stratum lying intermediately anterior to the epithelium of the posterior iridial surface.
It is the neural, sensory stratum of the eyeball. Thin and thickest near the optic disc.
Photoreceptors of the retina
Rod and cone cells
An oval, yellowish area located near the center of the retina which has a central depression
A central depression where visual resolution is highest.
Cheifly responsible for high spatial resolution and colour vision in good kighting cinditions (photopic vision)
Three types of cones according to their maximul special sensitivities
Red, green, blue
Provide high monochromatic sensitivity to a much wider range of illumination down to ,uch lower intensities (scotopic vision)
This region, where retinal tissues meet the neural elements of the optic nerve.
Exit point for the optic nerve fibers and entry and exit poit for retinal circulation
The component of the eye which transmit and refract light
Total quantity is small, filling the anterior and posterior chamber. Produced by ciliary process, and is an avenue for nutrients and metabolic exchange.
Fill the vitreour chamber, occupying about 4/5s of the eyeball. Colorless and consists of 99 per cent water
Is a transparent, encapsulated, biconvex body placed between the iris and the vitreous body.
Collectively forming the zonule holding the lens
Ideal state of the eye in which no refractive error is present
Also know as nearsightedness, is a conditon in which a person can see near objectsmore clearly than distant objects. Light focuses in FRONT of the retina
Also know as farsightedness, is a condition in which a person can see distant objects more clearly that near objects. Light focuses BEHIND the retina.
Normal part of aging; it develops as the lens of the eye becomes less flexible and loss its ability to focus on near objects.
A conditon in which objects, both near and far appear blurred. It often occurs in combination with myopia and hyperopia.
Is a cloudiness or opacification in the normally clear and transparent lens of the eye.
Two movable folds, with the upper being more larger and movable, due to the presence of the LEVATOR PALPEBRA SUPERIORIS. Covered by skin, externally, and mucous membrane in the deep aspect.
Sebaceous glands on the eyelids
Glands of Zeis
Infection of the sebaceous gland or glands of zeis
Sweat glands of the eyelids
Glands of Moll
Etremely loose and easily distended by blood and fluid
Loose subcutaneous tissue
Orbicularis oculi muscle
Contain sensory nerves
2 thin plates of dense connective tissue, which forms and supports the eyelid. Receives the levator palpebra superioris
Mucous membrane that attaches the eyeball to the eyelid (palpebral or bulbar)
Secretes a complex fluid (tears) whose excretoy ducts convey fuild to surface of the eye.
Secretes tears, which are alkalinic, water and contain WHAT
Located in the lacrimal fossa and presents a fundus
3/4 of an inch in lenth and drains into the inferior nasal something
Contains the eyeball in its anterior part and the posterior part is filled with fat, fascia, muscles, blood vessels, and nerves.
Separates the anterior and posterior
Capsule of Tenon
Lines the orbit and is continuous with the dura mater of rhe brain
Nerve that inervates to the Lateral Rectus muscle
Adbucent Nerve (CN VI)
Nerve that inervates tge Superior Oblique muscle
Trochlear Nerve (CN IV)