Muscles Of The Eye

Question 1

Intrinsic muscle use

Answer 1

Control pupil diameter

Accommodation to see near objects

Question 2

Extrinsic muscle use

Answer 2

Move the eye

Question 3

What elevates the eyelid?

Answer 3

Lavator palpebrae superioris

Question 4

Where does the superior oblique arise from?

Answer 4

Roof of obit posteriorly

Question 5

Where does the inferior oblique arise from?

Answer 5

Floor of orbit anteriorly

Question 6

What supplies the lateral rectus?

Answer 6

Abducens (lateral rectus abducts)

Question 7

What does the trochlear nerve supply

Answer 7

Superior oblique

Question 8

What movement is intorsion?

Answer 8

Top of eyeball rotates towards the nose

Question 9

Extorsion is what?

Answer 9

The top of the eyeball moving away from the nose

Question 10

Why do ocular muscles have more than one action?

Answer 10

They’re attached along the orbital axis

Question 11

What is strabismus?

Answer 11

Squint

Misalignment of the eye

Question 12

What’s esotropia?

Answer 12

Manifests as a convergent squint

Question 13

What’s exotropia?

Answer 13

Manifests as a divergent squint

Question 14

What’s amblyopia?

Answer 14

Lazy eye

Question 15

Why does amblyopia occur?

Answer 15

Brain suppresses image of one eye leading to poor image without any pathology

Question 16

When does diplopia occur?

Answer 16

Occurs in squints as a result of nerve palsies

Question 17

What supplies the intrinsic eye muscles the cilliaris and the constrictor muscles in the papillary body?

Answer 17

PS III

Question 18

What supplies the dilator pupillae?

Answer 18

Sympathetic plexus around blood vessels

Question 19

Pupillary constriction; P or SP?

Answer 19

SP

Question 20

Dilation of pupils; P or SP?

Answer 20

S

Question 21

Pathway of the light reflex afferent limb

Answer 21

Light falls on retina
Impulses travel along optic nerve 
Optic chiasma 
Optic tract
Midbrain
Edinger-Westphal nucleus (EWN of both sides)

Question 22

In what conditions would the pupils look different sizes?

Answer 22

Horner’s syndrome

Question 23

Where is optic neuritis commonly seen?

Answer 23

MS

Question 24

4 S+S of horner’s syndrome

Answer 24

Unequal pupil sizes
Ptosis
Miosis (excessive constriction of pupils)
Anhidrosis (loss of sweating of affected side)