Optho

Question 1

3 layers of the eye

Answer 1

Fibrous tunic, vascular tunic, nervous tunic

Question 2

Outer layer of the eye

Answer 2

Fibrous tunic. Sclera & cornea

Question 3

Midle layer of eye

Answer 3

Vascular tunic. Also known as uvea, choroid, tapetum lucidum/pecten oculi, ciliari body, iris, corpora nigra, pupil

Question 4

Inner layer of eye

Answer 4

Nervous tunic. Retina,photoreceptors, lens

Question 5

Sclera

Answer 5

white of the eye, caudal part of the fibrous tuinc, function- shape and protection

Question 6

Cornea

Answer 6

Transparent window, rotral part of the eye, cover iris and anterior chamber, nonvascular. Function- Pain reception & admits light to interior of the eye

Question 7

Choroid

Answer 7

Posterier part of vascualr tuinic, thin dark membrane, forms highly reflective area in rear of eye called tapetum lucidum, suplies nutrition to retina

Question 8

Tapetum lucidum/pecten Oculi

Answer 8

Highly reflective area in back of eye. light amlifier,herbavoirs are green/yellow, carnivors are blue/green. Pigmented to protect from UV rays in reptiles and birds.

Question 9

Ciliary body

Answer 9

Thickest portion of the vascular tunicbetween choroid and iris

Question 10

Ciliary muscle

Answer 10

Attaches to the suspensery ligaments

Question 11

Ciliary processes

Answer 11

Secrete aqueous humor

Question 12

Suspensory ligament/zonular ligament

Answer 12

Holds lens in position, allows shape of lens to change due to actions of ciliary muscles

Question 13

Accommodation

Answer 13

Process of altering the shape of the lens

Question 14

Iris

Answer 14

Colored doughnut shaped part of the eye surrounding pupil, contains 2 layers of muscles and increases and decreses size by controling the amount of light entering the eye

Question 15

Corpora nigra(horse)/Granula iridica(Cow)

Answer 15

Protects eye from direct sunlight

Question 16

Pupil

Answer 16

Cetral opening of the iris that lets light into the eye

Question 17

Heterochromia

Answer 17

Variations in iris color, an excess of lack of pigmentation

Question 18

Heterochromia iridis

Answer 18

Variations of color of different regions i iris of the same eye

Question 19

Heterochroia iridum

Answer 19

Variations of iris color between two eyes

Question 20

Fundus

Answer 20

General term for the portion of an organ opposite its opening

Question 21

Retina

Answer 21

Lines only caudal part of eye

Question 22

Photoreceptors

Answer 22

Lighe sensetive 1st layer fo the retina, dentrites-rods and cones, domestic anomals have many rods and few cones

Question 23

Rods

Answer 23

Sensitive to dim light (night vision) & shapes

Question 24

Cones

Answer 24

Sensitive to color and sharpness

Question 25

Lens

Answer 25

Transparent biconvex structure, located caudal to iris, part of the refracting mechanism of eye

Question 26

Refraction

Answer 26

The bending of light to a center point of focus

Question 27

Palpebrae

Answer 27

Eyelids, 2 moveable folds protecting rostral surface of the eye

Question 28

Blepharo

Answer 28

Prefix for eyelid

Question 29

Lateral and medial canthi

Answer 29

Angles where upper and lower eyelids meet

Question 30

Canthus

Answer 30

Where lids come together

Question 31

Meibomian Gland

Answer 31

Exocrine gland associated with each lash secretes an oil that has component of tears

Question 32

conjunctiva

Answer 32

Mucus membrane lining eylid and eyball, produces mucous inner layer of tears and has antibiotic substance that helps protect the eye