Identify the parts of the fibrous layer.
A. Cornea and lens
B. Cornea and iris
C. Sclera and conjunctiva
D. Sclera and cornea
answer
D;
question
Identify the structure that allows light to first enter the eye.
A. Cornea
B. Lens
C. Sclera
D. Pupil
answer
A; Correct. The cornea is the transparent portion of the fibrous layer where light enters the eyeball into the anterior chamber before passing through the pupil to the lens.
question
Name the largest portion of the fibrous layer.
A. Choroid
B. Sclera
C. Conjunctiva
D. Cornea
answer
B
question
Which cranial nerve carries visual information from the eyeball to the brain?
A. Oculomotor nerve
B. Olfactory nerve
C. Vestibulocochlear nerve
D. Optic nerve
answer
D; Correct. Cranial nerve II, the optic nerve, carries sensory information from the eyeball to the brain.
question
Only the fibrous layer can be observed in its entirety from the superficial surface of the cow eye.
True
False
answer
true
question
Identify the fluid filled space between the cornea and iris.
A. Anterior segment
B. Posterior chamber
C. Posterior segment
D. Anterior chamber
answer
D; Correct. The anterior chamber is the fluid filled space between the cornea and iris.
question
Identify the structure that regulates the amount of light entering the posterior segment of the eye.
A. Iris
B. Cornea
C. Lens
D. Pupil
answer
A; Correct. The iris is a muscular structure composed of both circular and radially arranged smooth muscle cells. It is capable of changing the shape of the pupil, thereby adjusting the amount of light passing through the lens.
question
Identify the areas that are filled with aqueous humor.
A. The anterior and posterior chambers
B. The posterior chamber and the posterior segment
C. The anterior and posterior segments
D. The anterior chamber and the posterior segment
answer
A; Correct. The anterior and posterior chambers make up the anterior segment, which is filled with aqueous humor.
question
The iris divides the eye into the anterior and posterior segments.
False
True
answer
false; Correct. The lens divides the eye into the anterior segment, located in front of the lens, and the posterior segment, located behind the lens.
question
The pupil can adjust its size independent of the iris.
True
False
answer
false; Correct. The iris changes the diameter of the opening at its center, which is known as the pupil.
question
Identify the muscular structure that anchors the lens in place.
A. Iris
B. Ciliary body
C. Suspensory ligaments
D. Choroid
answer
B; The ciliary body contains ciliary muscle that attachs the lens through the suspensory ligaments, anchoring it in place.
question
Where is the vitreous body located?
A. Anterior chamber
B. Anterior segment
C. Posterior segment
D. Posterior chamber
answer
C; Correct. The vitreous body is the thick fluid that fills the back of the eyeball behind the lens.
question
Identify the neural layer.
A. Sclera
B. Retina
C. Choroid
D. Optic nerve
answer
B; Correct. The retina is the neural layer that senses incoming visual information and sends that sensory input to the brain through the optic nerve.
question
Which of the following structures is highly vascular?
A. Sclera
B. Cornea
C. Retina
D. Choroid
answer
D; Correct. The choroid is the vascular layer. It is a membrane with a rich blood supply which nourishes the eye. It's dense blood supply gives the choroid a very dark color.
question
Which of the following regions is known as the blind spot?
A. Ciliary body
B. Optic disc
C. Fovea centralis
D. Macula lutea
answer
B; Correct. The optic disc is where the optic nerve exits the eye. Photoreceptor cells are not present in this region, and therefore visual information can not be received in this area.
question
Identify the incorrect statement regarding the vitreous body.
A. Supports the posterior surface of the lens
B. Transmits light
C. Holds the retina against the choroid
D. Consists of a thin, watery fluid
answer
D; Correct. The vitreous body is the gelatinous fluid that fills the posterior segment. The aqueous humor found in the anterior segment is a thin watery fluid.
question
How many extrinsic eye muscles are attached to the exterior surface of each eyeball?
A. three
B. four
C. five
D. six
answer
D
question
The wall of the eye has three layers. The outermost fibrous layer is made up of the opaque white sclera and the transparent __________.
A. lacrima
B. choroid
C. cornea
D. ciliary gland
answer
C
question
The __________ is a clear, watery fluid that helps to maintain the intraocular pressure of the eye and provides nutrients for the avascular lens and cornea.
A. aqueous humor
B. vitreous humor
answer
A
question
At the optic chiasma, the fibers from the medial side of each eye cross over to the opposite side.
True
False
answer
true
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