W3: S1+2 - Orbit and Eye

Question 1

Answer 1

Question 2

Answer 2

Question 3

What structures pass through the optic foramen (optic canal)?

Answer 3

• Optic nerve
• Opthalmic artery

Question 4

What 5 structures pass through the superior orbital fissure?

Answer 4

• Abducens nerve
• Occulomotor nerve
• Trochlear nerve
• Opthalmic division of trigeminal nerve
• Opthalmic veins

Question 5

What nerve passes through the inferior orbital fissure?

Answer 5

Maxillary division of trigeminal

Question 6

What are the main contents of the orbit?

Answer 6

• Eyeball
• Extrinsic ocular muscles
• Ligaments supporting the eye
• Optic nerve
• Branches of opthalmic artery
• Lacrimal apparatus
• Opthalmic veins

Question 7

What are the three component parts of the eyeball?

Answer 7

Outer fibrous layer

Middle vascular layer

Inner sensory layer

Question 8

What structures make up the outer fibrous layer and is it a complete layer?

Answer 8

• Cornea
• Sclera

It is a complete layer

Question 9

What structures make up the middle vascular layer of the eye and is it a complete layer?

Answer 9

• Ciliary body
• Iris
• Choroid

Incomplete layer anteriorly as the pupil

Question 10

What structures make up the inner sensory layer and is it a complete layer?

Answer 10

• Retina

Only present posteriorly

Question 11

What is the name given to the watery fluid in the anterior segment of the eye?

Answer 11

Aqueous humor

Question 12

What is the name given to the gel like fluid in the posterior part of the eye?

Answer 12

Vitreous humor

Question 13

Answer 13

Question 14

What secretes aqueous humor and where?

Answer 14

Ciliary body

In the posterior chamber

Question 15

What are the three intrinsic muscles of the eye?

Answer 15

Ciliaris

Sphincter pupillae

Dilator pupillae

Question 16

Where is the ciliaris muscle located?

Answer 16

The vascular layer surrounding the iris

Question 17

What is the action of the ciliaris?

Answer 17

Used in accomodation

Question 18

What is the innervation of the ciliaris?

Answer 18

Parasympathetic

• Occulomotor

Question 19

Where is the sphincter pupillae located?

Answer 19

Pupillary border of the iris

Question 20

What is the action of the sphincter pupillae?

Answer 20

Narrowing the pupil

Question 21

What is the innervation of the sphincter pupillae?

Answer 21

Parasympathetic

• Occulomotor nerve

Question 22

Where is the dilator pupillae located?

Answer 22

Outer to inner border of the iris

Question 23

What is the action of the dilator pupillae?

Answer 23

Widens the pupil

Question 24

What is the innervation of the dilator pupillae?

Answer 24

Sympathetic innervation

Question 25

What eye movement is looking up?

Answer 25

Elevation

Question 26

What eye movement is looking medially?

Answer 26

Adduction

Question 27

What eye movement is looking down?

Answer 27

Depression

Question 28

What eye movement is looking towards the temples?

Answer 28

Abduction

Question 29

What is the name given to the eye movement that keeps the eye on a level plane when the head is tilted?

Answer 29

Intorsion and extorsion

Question 30

What are the 6 extrinsic muscles of the eye?

Answer 30

4 Recti - Lateral - Medial - Superior - Inferior 2 Obliques - Superior - Inferior

Question 31

Identify

Answer 31

A: Medial rectus B: Superior rectus C: Superior oblique D: Inferior oblique E: Inferior rectus F: Lateral rectus

Question 32

What other muscle is also considered an extrinsic eye muscle even though it has no effect on the eyeball itself?

Answer 32

Levator palpebrae superioris

Question 33

What muscles are supplied by occulomotor nerve?

Answer 33

Recti - Superior rectus - Medial rectus - Inferior rectus Oblique - Inferior oblique Other - Levator palpebrae superioris

Question 34

What muscle is supplied by the trochlear nerve?

Answer 34

Superior oblique - Remember this by the fact that the superior oblique is attached to a trochlea to allow it to turn the eye

Question 35

What muscles are innervated by abducens nerve?

Answer 35

- Lateral rectus

Question 36

What is the only muscle that does not arise from the posterior aspect of the orbit?

Answer 36

Inferior oblique

Question 37

What ligaments prevent overadduction and overabduction of the eye?

Answer 37

Medial and lateral check ligaments

Question 38

What is the function of the extrinsic suspensory ligament?

Answer 38

Resist the posterior pull of the recti

Question 39

What branch of the ICA supplies the orbit and the eye, shown below

Answer 39

Opthalmic artery