Sheep Eye Dissection

Question 1

What are the two parts of the outer ear?

Answer 1

A) Pinna

B) Auditory Canal

Question 2

What are the four parts of the middle ear?

Answer 2

A) Ear drum
B) Ossicles
C) Oval Window
D) Eustachian Tube

Question 3

What are the three parts of the inner ear?

Answer 3

A) Cochlea
B) Auditory Nerve
C) Semicircular Canals

Question 4

Where is the location of the finna? What is it’s structure and function?

Answer 4

Structure: Shaped like funnel
Function: Collect sound and send to auditory canal
Location: Outer Ear

Question 5

Where is the location of the auditory canal? What is its structure and function?

Answer 5

Structure: Tube like, 2.5 cm connects to pinna and eardrum.
Function: Send sound to ear drum.
Location: Outer Ear.

Question 6

Where is the eardrum? What is its structure and function?

Answer 6

Structure: Thin Membrane
Function: a. seperate outer ear and inner ear
b. vibrate sound waves and hit ossicles
Location: Middle Ear.

Question 7

Where is the ossicles? What is its structure and function?

Answer 7

Structure: 3 Tiny Bones - Eardrum - Oval window
Function: Magnifies the vibration - send to ear drum.
Location: Middle Ear

Question 8

Where is the Oval window? What is its structure and function?

Answer 8

Structure: Thin membrane at the end of Ossicles, seperate middle ear from inner ear.
Function: Transfer vibration from ossicles to inner ear.

Question 9

Where is the eustachian tube? What is its structure and function?

Answer 9

Structure: Tube that connects the middle ear to the throat.
Function: Balance air pressure.
Location: Middle ear

Question 10

Where is the cochlea? What is its structure and function?

Answer 10

Structure: Spiral shape tube filled with liquid linked to sensory receptor
Function: Detect vibration and connect to nerve impulse
Location: Inner ear

Question 11

Where is the Auditory nerve? What is its structure and function?

Answer 11

Structure: Nerve connecting ear to brain.
Function: Send nerve impulse from cochlea to brain to interpet sound.
Location: Inner ear

Question 12

Where is the semicircular canals? What is its structure and function?

Answer 12

Structure: 3 loop canal, contains fluid and sensory cells
Function: Help body maintain its balance
Location: inner ear

Question 13

What is the job of the cornea?

Answer 13

• transparent membrane that covers iris and

pupil. Focuses light on the retina.

Question 14

What does the pupil do?

Answer 14

Hole passes different amount of light.

Question 15

What does the iris do?

Answer 15

Colored part of the eye that controls the size of the pupil.,

Question 16

What does the sclera do?

Answer 16

Whites of the eye that form the outer covering

Question 17

What does the Aqueous Humor do?

Answer 17

Aqueous Humor- nutritious fluid between the iris and
the cornea. As we age, it breaks down and we begin
to see “floaters”

Question 18

What does the cillary muscle do?

Answer 18

Ciliary Muscles- produces aqueous humor and

controls lens shape

Question 19

What does the Lens do?

Answer 19

Lens- Bends light rays to the back of the eye –retina.
Elastic so change in shape allows for focus on
objects close up or far away

Question 20

What does the retina do?

Answer 20

• Full of light
receptors
which are
sensitive
to:
• Cones
-
Colour
• Rods
- Light
levels
• Massive
blood
supply is
also
needed

Question 21

What is the job of the virteous humor?

Answer 21

Vitreous Humor- transparent jelly-like fluid that fills

the eye and refracts light

Question 22

What is the job of the optic nerve?

Answer 22

Optic nerve sends messages picked up by the retina to the brain

Question 23

What is the “Blind spot”

Answer 23

• area where optic
  nerve attaches. No retina is
  located there so information
  cannot be picked up; “Blind”

Question 24

What is the choroid layer?

Answer 24

lies between the
sclera and the retina it provides
the blood supply to the eye.

Question 25

What is the tapetum lucidum?

Answer 25

iridescent film
under the retina that provides
animals with “night vision”