Eye (Key Terms)

Question 1

Define Conjunctiva

Answer 1

Thin layer of epithelial tissues, overlaying cornea and inside of eye lid

Question 1

Define Binocular vision

Answer 1

3D vision- larger field of view (predator eyes)

Question 2

Define Cilia

Answer 2

Eyelashes- protects eye, sensory detection

Question 3

Define Canthi

Answer 3

Corner of the eye where upper and lower eyelids meet

Question 4

Define Lacrimal, Harderian & Meibomian glands

Answer 4

Lacrimal: lies dorsoventral surface of eye- secretes tears, washing surface, tears drain into nasolacrimal duct

Meibomian: diffuse tissue lying under eyelids, contributes to tears

Harderian: lies under third eyelid, contributes to secretion of tears

Question 5

Define Nasolacrimal duct

Answer 5

Tube that carries tears from eye to nose

Question 6

Define Aqueous humour

Answer 6

Fluid Provides nutrition to corneal cells- glucose/ oxygen- filling anterior and posterior chamber

Question 7

Define Vitreous humour

Answer 7

Gelatinous material, keeps the shape- fills the vitreous body

Question 8

Define Sclera

Answer 8

Tough fibrous outer layer ‘white of the eye’
Extrinsic muscles insert
Limbus- junction between sclera and cornea

Question 9

Define Retina

Answer 9

senses light, sending signals to brain- most inner part of eye

Question 10

Define Ciliary Body

Answer 10

Contains smooth muscle fibers, contracts to control shape and thickness- involuntary
bends/ refracts light

Question 11

Define Iris

Answer 11

Pigmented, muscles contract or relax- changes size of pupil
mydriasis- bigger pupils
miosis- smaller pupils

Question 12

Define Tapetum Lucidum

Answer 12

Projects extra light onto retina, improves vision when dark

Question 13

Define Nictitating membrane

Answer 13

Protects cornea, sweeping across surface- distribute tears and remove debris