External Structure Of The Eyes

Question 1

 Are two movable structures composed of skin and two types of muscle: striated and smooth.
 Their purpose is to protect the eye from foreign bodies and limit the amount of light entering the eye.
 They serve to distribute tears that lubricate the surface of the eye.

Answer 1

Eyelids

Question 2

larger, more mobile, and contains tarsal plates made up of connective tissue.

Answer 2

Upper eyelid

Question 3

secrete an oily substance that lubricates the eyelid.

Answer 3

Meibomian glands

Question 4

 The eyelids join at two points:

Answer 4

the lateral (outer) canthus and medial (inner) canthus.

Question 5

two small openings that allow drainage of tears into the lacrimal system.

Answer 5

Puncta

Question 6

small, fleshy mass that contains sebaceous glands.

Answer 6

Caruncle

Question 7

white space between open eyelids

Answer 7

Palpebral fissure

Question 8

 are projections of stiff hair curving outward along the margins of the eyelids that filter dust and dirt from air entering the eye.

Answer 8

Eyelashes

Question 9

 Is a thin, transparent, continuous membrane that is divided into two portions:

Answer 9

Conjunctiva

Bulbar and palpebral conjunctiva

Question 10

lines the inside of the eyelids.

Answer 10

Palpebral conjunctiva

Question 11

covers most of the anterior eye, merging with the cornea at the limbus.

Answer 11

Bulbar conjunctiva

Question 12

 Consist of glands and ducts that lubricate the eye.

Answer 12

Lacrimal apparatus

Question 13

located in the upper outer corner of the orbital cavity just above the eye, produces tears.

Answer 13

Lacrimal gland

Question 14

 are the six muscles attached to the outer surface of each eyeball.
 These muscles and associated nerves control six different directions of eye movement.

Answer 14

Extraocular muscles