Anatomy Of The Eye

Question 1

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.

Answer 1

The eyeball

Question 2

Fascial sheath separting the eyeball from the orbital fat

Answer 2

Capsule of Tenon

Question 3

Two cavities of the eyeball

Answer 3

Anterior cavity and posterior cavity

Question 4

Further divided into anterior and posterior chambers due to the position of the iris

Answer 4

Anterior cavity

Question 5

Contains the acqueous humour produced by ciliary process

Answer 5

Anterior cavity

Question 6

Located behind the iris and contains the VITREOUS HUMOUR enclosed in hyaloid membrane

Answer 6

Posterior cavity

Question 7

What are the layers of the eyeball?

Answer 7

Fibrous coat, Vascular coat, and Neural coat

Question 8

Cosists of the scleraand cornea

Answer 8

Fibrous coat

Question 9

Relatively hard consistency, is a dense layer which, when distended by intraocuoar pressure, maintains the shale of the eyeball.

Answer 9

Sclera

Question 10

External surface is white and smooth and is in contact with the inner surface of the fascial sheath of the eyeball.

Answer 10

Sclera

Question 11

Provides passage for nerves of the cornea and vascular autonomic nevrs and attached for extrinsic eye muscles.

Answer 11

Sclera

Question 12

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.

Answer 12

Cornea

Question 13

Cointains the Choroid, teh ciliary body, and the iris

Answer 13

Vascular coat

Question 14

Is a thin, highly vascular, dark brown tissue which lines almost the posterior 5/6 of the eye.

Answer 14

Choroid

Question 15

Pierced behind the optic nerve and is firmly adherent to the sclera.

Answer 15

Choroid

Question 16

Thicker posteriorly, and internally it si firmly attached to the retinal pigmented layer

Answer 16

Choroid

Question 17

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

Answer 17

Ciliary body

Question 18

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

Answer 18

Ciliary body

Question 19

Is an adjustable diaphragm around a central aperture.

Answer 19

Iris

Question 20

Concentration of these cells is the main factor determining the hue of the iris

Answer 20

Melanocytes

Question 21

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.

Answer 21

Sphicnter pupillae

Question 22

A thin stratum lying intermediately anterior to the epithelium of the posterior iridial surface.

Answer 22

Dilator pupillae

Question 23

It is the neural, sensory stratum of the eyeball. Thin and thickest near the optic disc.

Answer 23

Retina

Question 24

Photoreceptors of the retina

Answer 24

Rod and cone cells

Question 25

An oval, yellowish area located near the center of the retina which has a central depression

Answer 25

Macula lutea

Question 26

A central depression where visual resolution is highest.

Answer 26

Fovea centralis

Question 27

Cheifly responsible for high spatial resolution and colour vision in good kighting cinditions (photopic vision)

Answer 27

Cone cells

Question 28

Three types of cones according to their maximul special sensitivities

Answer 28

Red, green, blue

Question 29

Provide high monochromatic sensitivity to a much wider range of illumination down to ,uch lower intensities (scotopic vision)

Answer 29

Rod cells

Question 30

This region, where retinal tissues meet the neural elements of the optic nerve.

Answer 30

Optic disc

Question 31

Exit point for the optic nerve fibers and entry and exit poit for retinal circulation

Answer 31

Optic disc

Question 32

The component of the eye which transmit and refract light

Answer 32

Refractive media

Question 33

Total quantity is small, filling the anterior and posterior chamber. Produced by ciliary process, and is an avenue for nutrients and metabolic exchange.

Answer 33

Aqueous humour

Question 34

Fill the vitreour chamber, occupying about 4/5s of the eyeball. Colorless and consists of 99 per cent water

Answer 34

Vitreous body

Question 35

Is a transparent, encapsulated, biconvex body placed between the iris and the vitreous body.

Answer 35

Lens

Question 36

Collectively forming the zonule holding the lens

Answer 36

Zonular fibers

Question 37

Ideal state of the eye in which no refractive error is present

Answer 37

Emmetropia

Question 38

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

Answer 38

Myopia

Question 39

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.

Answer 39

Hyperopia

Question 40

Normal part of aging; it develops as the lens of the eye becomes less flexible and loss its ability to focus on near objects.

Answer 40

Presbyopia

Question 41

A conditon in which objects, both near and far appear blurred. It often occurs in combination with myopia and hyperopia.

Answer 41

Astigmatism

Question 42

Is a cloudiness or opacification in the normally clear and transparent lens of the eye.

Answer 42

Cataract

Question 43

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.

Answer 43

Eyelid

Question 44

Sebaceous glands on the eyelids

Answer 44

Glands of Zeis

Question 45

Infection of the sebaceous gland or glands of zeis

Answer 45

Sty

Question 46

Sweat glands of the eyelids

Answer 46

Glands of Moll

Question 47

Etremely loose and easily distended by blood and fluid

Answer 47

Loose subcutaneous tissue

Question 48

Orbicularis oculi muscle

Answer 48

Muscular layer

Question 49

Contain sensory nerves

Answer 49

Submuscular layer

Question 50

2 thin plates of dense connective tissue, which forms and supports the eyelid. Receives the levator palpebra superioris

Answer 50

Tarsal plates

Question 51

Mucous membrane that attaches the eyeball to the eyelid (palpebral or bulbar)

Answer 51

Conjucntiva

Question 52

Secretes a complex fluid (tears) whose excretoy ducts convey fuild to surface of the eye.

Answer 52

Lacrimal gland

Question 53

Secretes tears, which are alkalinic, water and contain WHAT

Answer 53

Lysozyme

Question 54

Located in the lacrimal fossa and presents a fundus

Answer 54

Lacrimal sac

Question 55

3/4 of an inch in lenth and drains into the inferior nasal something

Answer 55

Nasolacrimal duct

Question 56

Contains the eyeball in its anterior part and the posterior part is filled with fat, fascia, muscles, blood vessels, and nerves.

Answer 56

Orbit

Question 57

Separates the anterior and posterior

Answer 57

Capsule of Tenon

Question 58

Lines the orbit and is continuous with the dura mater of rhe brain

Answer 58

Periorbita

Question 59

Nerve that inervates to the Lateral Rectus muscle

Answer 59

Adbucent Nerve (CN VI)

Question 60

Nerve that inervates tge Superior Oblique muscle

Answer 60

Trochlear Nerve (CN IV)

Question 61

Inervates the rest of the eye muscles

Answer 61

Occulomotor nerve (CN III)