Question 1

The conjunctiva is a mucous membrane that covers the entire anterior surface of the eyeball, including the cornea.

Accepted Answer

A) True 
 B)False

Question 2

Why is the optic disc sometimes called the blind spot of the eye?

Accepted Answer

A)  There are no rods and cones there.
B)  There are no nerve fibers there.
C)  There are no blood vessels there.
D)  There are rods there, but no cones, so color vision is not possible in that area.
E)  There are cones there, but no rods, so black and white vision is not possible in that area.F) A) and D)
G) C) and E)

Question 3

Which structure of the cow (or sheep) eye is not present in humans, and helps to reflect light back through the retina, to provide good night vision?

Accepted Answer

A)  Tarsal gland
B)  Trochlea
C)  Blind spot
D)  Tapetum fibrosum
E)  Ora serrataF) A) and C)
G) None of the above

Question 4

Which portion of the lacrimal apparatus consists of 2 small pores that drain the tears off of the surface of the eye?

Accepted Answer

A)  Lacrimal sac
B)  Lacrimal gland
C)  Nasolacrimal duct
D)  Lacrimal puncta
E)  CanaliculiF) A) and B)
G) A) and C)

Question 5

The pupil is an opening in the ciliary body, which allows light to enter the eye.

Accepted Answer

A) True 
 B)False

Question 6

The inner layer of the eye consists of the pigmented and neural portions of the

Accepted Answer

A)  choroid and ciliary body.
B)  retina and optic nerve.
C)  lens and iris.
D)  sclera and cornea.
E)  lacrimal gland.F) B) and D)
G) All of the above

Question 7

What is the function of the ciliary muscles?

Accepted Answer

A)  They change the shape of the lens to accommodate near or far vision.
B)  They change pupil diameter when lighting conditions change.
C)  They close the upper eyelid.
D)  They abduct the eye.
E)  They open the upper eyelid.F) A) and D)
G) A) and C) A

Question 8

All of the following cranial nerves innervate the extrinsic eye muscles except

Accepted Answer

A)  the facial nerve.
B)  the abducens nerve.
C)  the trochlear nerve.
D)  the oculomotor nerve.
E)  all of these cranial nerves innervate the extrinsic eye muscles.F) A) and D)
G) All of the above

Question 9

Which of the following is NOT true of cones?

Accepted Answer

A)  They provide for color vision.
B)  Only cones are found in the fovea centralis.
C)  Cones are much more numerous than rods in the peripheral portions of the retina.
D)  Cones are responsible for sharp vision.
E)  All of these are true of cones.F) A) and D)
G) A) and C) C

Question 10

Which of the following extrinsic eye muscles rotates the eyeball inferiorly and laterally?

Accepted Answer

A)  Superior rectus
B)  Inferior oblique
C)  Inferior rectus
D)  Superior oblique
E)  Lateral rectusF) B) and E)
G) A) and E)

Question 11

The aqueous humor occupies and flows through the anterior and posterior chambers and the pupil.

Accepted Answer

A) True 
 B)False

Question 12

What is the significance of the scleral venous sinus?

Accepted Answer

A)  It produces the aqueous humor.
B)  It drains blood from the inner layer of the eyeball.
C)  It reabsorbs aqueous humor, to maintain proper pressure in the anterior cavity.
D)  It produces the vitreous humor.
E)  It reabsorbs vitreous humor, to maintain proper pressure in the posterior cavity.F) A) and C)
G) A) and D) C

Question 13

All of the following structures in the eye are black, due to the presence of melanin pigment, except

Accepted Answer

A)  the choroid.
B)  the ciliary body.
C)  the retina.
D)  the pigmented epithelium.
E)  All of these eye structures are black, due to the presence of melanin pigment.F) A) and D)
G) All of the above

Question 14

Vision is one of the special senses, because its receptors are found within complex sensory organs in the head.

Accepted Answer

A) True 
 B)False

Question 15

The area in which the nerve fibers of the retina leave the eye to become the optic nerve is called the

Accepted Answer

A)  ora serrata.
B)  ciliary process.
C)  macula lutea.
D)  trochlea.
E)  optic disc.F) A) and B)
G) B) and D)

Question 16

What is the function of the suspensory ligaments?

Accepted Answer

A)  They suspend the iris in the anterior cavity of the eye.
B)  They hold the retina against the choroid.
C)  They hold the optic nerve in place in the posterior portion of the eye.
D)  They hold the lens in position, suspended from the ciliary body.
E)  They hold the choroid against the sclera.F) A) and B)
G) A) and C)

Question 17

Which of the following structures secrete(s) an oily lubricant for the surface of the eye?

Accepted Answer

A)  Ciliary body
B)  Lacrimal glands
C)  Conjunctiva
D)  Pigmented epithelium
E)  Tarsal glandsF) All of the above
G) B) and C)

Question 18

In a sandstorm, which of the following muscles would protect the eyes, by closing the eyelids?

Accepted Answer

A)  Levator palpebrae superioris
B)  Orbicularis oculi
C)  Superior rectus and inferior rectus
D)  Lateral rectus and medial rectus
E)  Superior oblique and inferior obliqueF) C) and D)
G) All of the above

Question 19

The anterior cavity of the eyeball is much smaller than the posterior cavity.

Accepted Answer

A) True 
 B)False

Question 20

The innermost (most anterior) layer of the retina consists of

Accepted Answer

A)  rods and cones.
B)  bipolar neurons.
C)  the pigmented epithelium.
D)  nerve fibers of the ganglion cells.
E)  amacrine cells.F) B) and C)
G) C) and D)

Exam 36: Eye Structure

The conjunctiva is a mucous membrane that covers the entire anterior surface of the eyeball, including the cornea.

Correct AnswerverifiedShow Answer

Why is the optic disc sometimes called the blind spot of the eye?

Correct AnswerverifiedShow Answer

Which structure of the cow (or sheep) eye is not present in humans, and helps to reflect light back through the retina, to provide good night vision?

Correct AnswerverifiedShow Answer

Which portion of the lacrimal apparatus consists of 2 small pores that drain the tears off of the surface of the eye?

Correct AnswerverifiedShow Answer

The pupil is an opening in the ciliary body, which allows light to enter the eye.

Correct AnswerverifiedShow Answer

The inner layer of the eye consists of the pigmented and neural portions of the

Correct AnswerverifiedShow Answer

What is the function of the ciliary muscles?

Correct AnswerverifiedA

All of the following cranial nerves innervate the extrinsic eye muscles except

Correct AnswerverifiedShow Answer

Which of the following is NOT true of cones?

Correct AnswerverifiedC

Which of the following extrinsic eye muscles rotates the eyeball inferiorly and laterally?

Correct AnswerverifiedShow Answer

The aqueous humor occupies and flows through the anterior and posterior chambers and the pupil.

Correct AnswerverifiedShow Answer

What is the significance of the scleral venous sinus?

Correct AnswerverifiedC

All of the following structures in the eye are black, due to the presence of melanin pigment, except

Correct AnswerverifiedShow Answer

Vision is one of the special senses, because its receptors are found within complex sensory organs in the head.

Correct AnswerverifiedShow Answer

The area in which the nerve fibers of the retina leave the eye to become the optic nerve is called the

Correct AnswerverifiedShow Answer

What is the function of the suspensory ligaments?

Correct AnswerverifiedShow Answer

Which of the following structures secrete(s) an oily lubricant for the surface of the eye?

Correct AnswerverifiedShow Answer

In a sandstorm, which of the following muscles would protect the eyes, by closing the eyelids?

Correct AnswerverifiedShow Answer

The anterior cavity of the eyeball is much smaller than the posterior cavity.

Correct AnswerverifiedShow Answer

The innermost (most anterior) layer of the retina consists of

Correct AnswerverifiedShow Answer

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