Anatomy Worksheet

Question 1

What are the two parts of the first tunic?

Answer 1

The sclera and the cornea

Question 2

What is the thickest layer of the cornea?

Answer 2

Stroma

Question 3

What is the limbus?

Answer 3

The junction between the sclera and the cornea

Question 4

What is axial length of the average human eye?

Answer 4

26.5 mm: Based upon a radius of 12 mm giving a diameter of the globe of 24mm with a 2.5mm protrusion of the cornea.

Question 5

What muscle controls the movement of the eyebrows?

Answer 5

Frontalis muscle

Question 6

Name two functions of the eyelids.

Answer 6

Protection (Closing), distributing tear film over cornea and sclera, provide oxygen through blood vessels during sleep (closed eye)

Question 7

What is another name for the eyelids?

Answer 7

Palpebrae

Question 8

What is the primary function of the iris?

Answer 8

To control the amount of light that enters the eye

Question 9

Which muscle relaxes and allows the lid to droop when a person is tired?

Answer 9

Muller’s Muscle

Question 10

Name the five layers of the cornea, from outermost to innermost in order:

Answer 10

Epithelium, Bowman’s layers, Stroma, Descemet’s membrane, Endothelium

Question 11

What is the power of the cornea?

Answer 11

43 diopters

Question 12

What do humans have more of, rods or cones?

Answer 12

Rods

Question 13

Why are rhodopsin and iodopsin important?

Answer 13

Rhodopsin in rods provides night vision and iodopsin in cones provide color vision

Question 14

Retinal photoreceptors are sensitive to wavelengths between _____ nanometers?

Answer 14

380nm and 750nm

Question 15

Which area of the retina is responsible for fine detail vision?

Answer 15

The fovea - macula

Question 16

Where is the optic disc located?

Answer 16

At the point where the optic nerve leaves the eye

Question 17

Which layer of the tear film contains the nutrients and antibiotic properties that feed and protect the eye?

Answer 17

Aqueous

Question 18

What is the term for the eyelids turning inward?

Answer 18

Entropion

Question 19

What is the term for drooping eyelids

Answer 19

Ptosis

Question 20

How many muscles control the movement of the eyeball?

Answer 20

Six

Question 21

Name the 4 straight muscles that control movement of the eye?

Answer 21

Medial rectus, lateral rectus, superior rectus, inferior rectus

Question 22

Name the 2 slanted muscles that control movement of the eye?

Answer 22

Superior oblique, inferior oblique

Question 23

Where does visual fusion occur?

Answer 23

In the brain

Question 24

What is the condition whereby a muscle imbalance leads to loss of vision due to lack of fusion?

Answer 24

Amblyopia (Lazy eye)