Vision

Question 1

Why do we have eyebrows?

Answer 1

Shading the eye
Preventing perspiration from reaching the eye

Question 2

What muscle depresses the eyebrow?

Answer 2

Orbicularis muscle

Question 3

What muscle moves the eyebrows medially?

Answer 3

Corrugator muscles

Question 4

The course hairs that overlie the supraorbital margins form the…

Answer 4

Eyebrows

Question 5

What are the palpebrae?

Answer 5

Eyelids

Question 6

What is the function of the palpebrae?

Answer 6

Protect the eye anteriorly

Question 7

What does the palpebral fissure do?

Answer 7

Separate the eyelids

Question 8

What supports the eyelids internally?

Answer 8

The tarsal plates of connective tissue

Question 9

What elevates the upper eyelid?

Answer 9

Levator palpebrae superioris

Question 10

What is the conjunctiva?

Answer 10

The transparent membrane that:
-Lines the eyelids as the palpebral conjunctiva
-Covers the whites of the eyes as the occlar conjunctiva
-Lubricates and protects the eye

Question 11

What is conjunctivitis?

Answer 11

Pink eye caused by the swelling of the conjunctiva

Question 12

What does the lacrimal gland do?

Answer 12

It produces and secretes tears aka lacrimal secretions

Question 13

True or false: Tears flow up and around the eyeball?

Answer 13

False- Tears flow down and across the eyeball

Question 14

What is the role of the lateral rectus muscle?

Answer 14

Moves eyes laterally

Question 15

What Cranial nerve controls the lateral rectus muscle?

Answer 15

VI (Abducens)

Question 16

What does the medial rectus muscle do?

Answer 16

Moves the eyes medially

Question 17

What cranial nerve controls the medial rectus muscle

Answer 17

III (occulomor)

Question 18

What does the superior rectus muscle do?

Answer 18

Elevate the eyes and turns it medially

Question 19

What cranial nerve controls the superior rectus muscle?

Answer 19

III (oculomotor)

Question 20

What does the inferior rectus muscle do?

Answer 20

Depresses the eye and turns it medially

Question 21

What cranial nerve controls the inferior rectus muscle?

Answer 21

III (oculomotor)

Question 22

What does the inferior oblique muscle do?

Answer 22

Elevates eye and turns it laterally
side eye lmao

Question 23

What cranial nerve controls the inferior oblique?

Answer 23

III (oculomotor)

Question 24

What muscle depresses the eye and turns it laterally?

Answer 24

Superior oblique
Sneak peak lol

Question 25

What cranial nerve controls the superior oblique?

Answer 25

IV (trochlear)

Question 26

What happens when the sphincter pupillae muscle contracts? What ANS controls this?

Answer 26

Pupil size decreases/constricts

Question 27

What muscles make up the iris?

Answer 27

Sphincter pupillae Dilator pupillae

Question 28

What happens when the dilator pupillae muscle contracts? What ANS system controls this?

Answer 28

Pupil size increases/dilates Sympathetic NS

Question 29

What is the optic disc?

Answer 29

The site where the optic nerve leaves the eye and there is a lack of photoreceptors aka blind spot

Question 30

What is the location of ganglion cell axons?

Answer 30

Run along the inner surface of the retina and leave the eye as the optic nerve

Question 31

What forms the optic nerve?

Answer 31

Axons of retinal ganglion cells

Question 32

Which fibers decussate at the optic chiasm?

Answer 32

Medial fibers of the optic nerve

Question 33

Where do most fibers of the optic tract continue to... The other optic tract fibers....

Answer 33

Lateral geniculate body of the thalamus end in the superior colliculi and pretectal nuclei

Question 34

What is the role of the superior colliculi?

Answer 34

Initiating visual reflexes

Question 35

What is the role of the pretectal nuclei?

Answer 35

Involved in pupillary reflexes

Question 36

Optic radiations travel from the ______ to the _______

Answer 36

Thalamus, visual cortex

Question 37

What is melanopsin?

Answer 37

Circadian Pigment- Sets daily biorhythms/biological clock

Question 38

True or false: A small subset of visual fibers contain melanopsin

Answer 38

True

Question 39

True or false: A small subset of visual fibers contain melanopsin

Answer 39

True

Question 40

Where are rods located?

Answer 40

Mostly peripheral retina

Question 41

Where are cones located?

Answer 41

Mostly central retina

Question 42

Which is more numerous? a) Rods b) Cones C) They are the same

Answer 42

A) Rods For every cone, there are 20 rods

Question 43

True or false: Color vision can be seen in rods via three visual pigments?

Answer 43

False- Colour is picked up by cones while non colour vision of visual pigment is rods

Question 44

I am highly sensitive and I function in dim light. I am a....

Answer 44

ROD

Question 45

I am not very sensitive and I function in bright light. I am a...

Answer 45

CONE