Special Senses - The Eye & Vision

Question 1

What is the clinical word for tears?

Answer 1

lacrimal secretions

Question 2

Tears enter
lacrimal …
and drain into
lacrimal …

Answer 2

canaliculi
sac

Question 3

Tears empty
into nasal cavity
via …

Answer 3

nasolacrimal duct

Question 4

… gland produces and
secretes tears

Answer 4

Lacrimal

Question 5

The white of the eye is refered to as the …

Answer 5

sclera

Question 6

The mucous membrane covering inner surface
of eyelids & outer surface of eyeball is called the …

Answer 6

conjunctiva

Question 7

What are the two cavities of the eye called?

Answer 7

• Anterior cavity
• Posterior cavity

Question 8

What are the three tunic layers of the eye called?

Answer 8

• Fibrous
• Vascular
• Neural

Question 9

The vitreous humor is a transparent, colorless, gel-like substance located in the … of the eye.

Answer 9

posterior cavity

Question 10

Aqueous humor fills the … and … chambers of the eye

Answer 10

anterior
posterior

Question 11

T or F
The cornea lacks blood vessels

Answer 11

T

Question 12

What is the most sensitive structure of the eye and why?

Answer 12

Cornea because of free nerve endings

Question 13

T or F
The choroid lacks blood vessels

Answer 13

F
Rich in blood vessels

Question 14

In the choroid, … minimise light scattering

Answer 14

melanocytes

Question 15

The … body coordinates the shape of the lens

Answer 15

ciliary

Question 16

Which two rings of muscle cause the eye to constrict and dilate? And in what direction are they arranged?

Answer 16

• sphincter pupillae, arranged longitudinally
• dilator pupillae, arranged radially

Question 17

Low light causes the …NS to dilate the pupils

Answer 17

S

Question 18

High light causes the …NS to contrict the pupils

Answer 18

P

Question 19

The lens is attached to the ciliary body by …

Answer 19

suspensory ligaments

Question 20

The ciliary body is under the control of what NS?

Answer 20

ANS

Question 21

Differences in density of … alter the speed of light molecules, and leads to a change in direction (bending)

Answer 21

medium

Question 22

Signal processing in the retina happens via what four cell types?

Answer 22

• Bipolar cells
  ─ Horizontal cells
  ─ Amacrine cells
  ─ Ganglion cells

Question 23

The “blind spot” of the eye is called the…

Answer 23

optic disc