Special Sense Organs Part 1

Question 1

T/F: The special sense organ of vision, the eye, is derived from both the ectoderm and the mesoderm.

Answer 1

True

Question 2

What are the fibrous coats of the eyes derived from?

Answer 2

mesoderm

Question 3

What parts of the eye are derived from the ectoderm?>

Answer 3

lens, retina, cornea, and pigmented layers

Question 4

What 3 coats make up the eye?

Answer 4

Fibrous tunic (outermost), vascular tunic, and the nervous tunic (retina)

Question 5

Which coat of the eye is made up of the sclera and cornea?

Answer 5

fibrous tunic

Question 6

What is the term for the thick, dense, firm, opaque, white part of the eye?

Answer 6

sclera

Question 7

What structure maintains the shape of the eye if internal pressure is increased?

Answer 7

sclera

Question 8

What kind of structures pass through the many openings of the sclera?

Answer 8

blood vessels and neurons

Question 9

T/F: extraocular muscles attach to the sclera.

Answer 9

True

Question 10

T/F: posteriorly, the sclera transitions to the cornea at the limbus and is lined with conjunctiva.

Answer 10

False; this occurs anteriorly

Question 11

What structure is the sclera continuous with posteriorly?

Answer 11

fibrous sheath that covers CN II

Question 12

What is the anterior part of the fibrous tunic?.

Answer 12

cornea

Question 13

T/F:The cornea is transparent, concave to the anterior, and is the primary refractory part of the eyeball.

Answer 13

False; should say convex to the anterior

Question 14

What are the 5 layers of the cornea from anterior to posterior?

Answer 14

Corneal epithelium, Anterior limiting lamina, Substantia propria, Posterior limiting lamina, and Endothelium (CASPE)

Question 15

Which layer of the cornea is continuous with the conjunctiva?

Answer 15

Corneal epithelium

Question 16

What layer of the cornea covers the inside surface of the cornea and lines the iridocorneal layer?

Answer 16

Endothelium

Question 17

What is the largest part of the cornea?

Answer 17

Substantia propria

Question 18

What are the 3 parts of the Vascular Tunic?

Answer 18

choroid, ciliary body, and iris

Question 19

T/F: the choroid is thin with a poor blood supply.

Answer 19

False; thin with a rich blood supply

Question 20

T/F: the blood vessels of the choroid are heavily supplied by autonomic, vasomotor fibers and may have a cooling effect.

Answer 20

True

Question 21

The choroid is loosely attached to the sclera except for where?

Answer 21

choroid is firmly attached to the sclera where the optic nerve pierces it

Question 22

What purpose does the dark pigmentation of the choroid serve?

Answer 22

helps limit the passage of light both through the sclera to the retina and through the retina to the sclera

Question 23

What is the ciliary body continuous to the anterior? to the posterior?

Answer 23

iris;

choroid

Question 24

T/F: the ciliary body serves to suspend the lens and produce aqueous fluid found in the anterior segment of the eye?

Answer 24

True

Question 25

T/F: the ciliary body may produce some glycosaminoglycans of the vitrous body.

Answer 25

True

Question 26

Where is the ciliary muscle contained?

Answer 26

ciliary body

Question 27

What is the function of the ciliary muscle?

Answer 27

contraction allows the lens to become more convex, allowing for near vision

Question 28

What is the colored part of the eye which ranges from light blue to dark brown?

Answer 28

Iris

Question 29

What divides the anterior segment of the eye into anterior and posterior chambers?

Answer 29

Iris

Question 30

What muscles does the Iris consist of?

Answer 30

sphincter pupillae and dilator pupillae

Question 31

What muscle contains fibers arranged circumferentially that constrict the pupil?

Answer 31

sphincter pupillae

Question 32

What muscle will cause the pupil to become larger when it contracts?

Answer 32

dilator pupillae

Question 33

T/F: the dilator pupillae is innervated by parasympathetic fibers.

Answer 33

False; dilator pupillae is sympathetic, sphincter pupillae is parasympathetic.