Anatomy Of The Eye Flashcards Preview

Regional Anatomy (Head And neck) > Anatomy Of The Eye > Flashcards

Flashcards in Anatomy Of The Eye Deck (61):
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.

The eyeball

2

Fascial sheath separting the eyeball from the orbital fat

Capsule of Tenon

3

Two cavities of the eyeball

Anterior cavity and posterior cavity

4

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

Anterior cavity

5

Contains the acqueous humour produced by ciliary process

Anterior cavity

6

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

Posterior cavity

7

What are the layers of the eyeball?

Fibrous coat, Vascular coat, and Neural coat

8

Cosists of the scleraand cornea

Fibrous coat

9

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

Sclera

10

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

Sclera

11

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

Sclera

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.

Cornea

13

Cointains the Choroid, teh ciliary body, and the iris

Vascular coat

14

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

Choroid

15

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

Choroid

16

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

Choroid

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

Ciliary body

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

Ciliary body

19

Is an adjustable diaphragm around a central aperture.

Iris

20

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

Melanocytes

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.

Sphicnter pupillae

22

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

Dilator pupillae

23

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

Retina

24

Photoreceptors of the retina

Rod and cone cells

25

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

Macula lutea

26

A central depression where visual resolution is highest.

Fovea centralis

27

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

Cone cells

28

Three types of cones according to their maximul special sensitivities

Red, green, blue

29

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

Rod cells

30

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

Optic disc

31

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

Optic disc

32

The component of the eye which transmit and refract light

Refractive media

33

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

Aqueous humour

34

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

Vitreous body

35

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

Lens

36

Collectively forming the zonule holding the lens

Zonular fibers

37

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

Emmetropia

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

Myopia

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.

Hyperopia

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.

Presbyopia

41

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

Astigmatism

42

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

Cataract

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.

Eyelid

44

Sebaceous glands on the eyelids

Glands of Zeis

45

Infection of the sebaceous gland or glands of zeis

Sty

46

Sweat glands of the eyelids

Glands of Moll

47

Etremely loose and easily distended by blood and fluid

Loose subcutaneous tissue

48

Orbicularis oculi muscle

Muscular layer

49

Contain sensory nerves

Submuscular layer

50

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

Tarsal plates

51

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

Conjucntiva

52

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

Lacrimal gland

53

Secretes tears, which are alkalinic, water and contain WHAT

Lysozyme

54

Located in the lacrimal fossa and presents a fundus

Lacrimal sac

55

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

Nasolacrimal duct

56

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

Orbit

57

Separates the anterior and posterior

Capsule of Tenon

58

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

Periorbita

59

Nerve that inervates to the Lateral Rectus muscle

Adbucent Nerve (CN VI)

60

Nerve that inervates tge Superior Oblique muscle

Trochlear Nerve (CN IV)

61

Inervates the rest of the eye muscles

Occulomotor nerve (CN III)