Exercise 6 Eyes

Question 1

There are 3 pairs of ???? muscles that regulate the motion of each eye, what is the group of muscles called?

Answer 1

extraocular muscles

Question 2

Which extraocular muscle moves the eye towards the nose?

Answer 2

medial rectus (MR)

Question 3

Which extraocular muscle moves the eye away from the nose?

Answer 3

lateral rectus (LR)

Question 4

Which extraocular muscle primarily moves the eye upward & secondly rotates the top of the eye toward the nose?

Answer 4

superior rectus (SR)

Question 5

Which extraocular muscle primarily moves the ye downward & secondly rotates the top of the eye away from the nose?

Answer 5

inferior rectus (IR)

Question 6

Which extraocular muscle primarily rotates the top of the eye toward the nose & secondarily moves the eye downward?

Answer 6

superior oblique (SO)

Question 7

Which extraocular muscle primarily rotates the top of the eye away from the nose & secondarily moves the eye upward?

Answer 7

inferior oblique (IO)

Question 8

The eye is situated in which cavity?

Answer 8

orbital cavity

Question 9

Sections of the eye: sphere of the eye is called?

Answer 9

eyeball

Question 10

Sections of the eye: white of the eye is called?

Answer 10

sclera - it is the outer tunic(layer) of the eye. It provides shape and support to the eye.

Question 11

Sections of the eye: the clear dome at the front of the eye?

Answer 11

cornea - “window” of the eye, allowing light into the interior of the eye.

Question 12

Sections of the eye: clear membrane covering the sclera but not the cornea.

Answer 12

conjunctiva. protects eye and produces mucus

Question 13

Sections of the eye: the circular opening in the centre of the coloured iris.

Answer 13

pupil. enlarging in dim light & contracting in bright light.

Question 14

Sections of the eye:coloured area consisting of involuntary smooth muscles which control the size of the pupil.

Answer 14

iris

Question 15

Sections of the eye: the clear gel that makes up approx. 80% of the eyes volume.

Answer 15

vitreous humour. it maintains the shape & helps refract light

Question 16

Sections of the eye: the innermost tunic of the eye.

Answer 16

retina. it receives visual stimuli via photoreceptors that transform light into electrical signals.

Question 17

Sections of the eye: oval-shaped yellow spot near the centre of the retina.

Answer 17

macula or macula lutes. it contains millions of light sensing cells that provide sharp, detailed central vision.

Question 18

Sections of the eye: nerve connecting the retina to the brain

Answer 18

optic nerve or second cranial nerve

Question 19

Sections of the eye: point where the optic nerve & blood vessels leave the eye

Answer 19

optic disk

Question 20

Sections of the eye: protect the eyes from the environment, injury & light.

Answer 20

eyelids - also spread tears evenly over the eye.

Question 21

Sections of the eye: protect the eyes from the elements & debris

Answer 21

eyelashes

Question 22

Tears are composed of 3 layers, what are they?

Answer 22

oil, water and mucous

Question 23

Tears eventually empty into the ???? sac?

Answer 23

lacrimal sac

Question 24

The lacrimal sac drains into the ???? duct which connects to the nasal passage.

Answer 24

nasolacrimal duct

Question 25

??? vision - what is seen when you look at it directly?

Answer 25

Central vision

Question 26

???? vision - the vision to the sides of the central point?

Answer 26

peripheral (side) vision. this allows you to find objects & detect threats.

Question 27

???? vision - the portion of the persons surroundings that can be seen at any one time in the peripheral vision whilst focusing the eyes on a central point.

Answer 27

visual field.

Question 28

Sections of the eye: formed by the cillary body, iris and choroid.

Answer 28

uveal tract

Question 29

Sections of the eye: middle tunic between the sclera & the retina which carries blood vessels nourishing the eye.

Answer 29

choroid