Orbit and Eye Flashcards Preview

Ophthalmology Anatomy > Orbit and Eye > Flashcards

Flashcards in Orbit and Eye Deck (39):
1

Which bones are present in the orbit?

Maxillary
Zygomatic
Frontal
Lacrimal
Ethmoid
Sphenoid

2

Which three bones have an "orbital plate"?

Frontal
Maxillary
Zygomatic

3

What are the components of the eyelids?

Tarsal plate with glands
Obicularis oculi
Levator palpebrae superioris

4

What is the tarsal plate?

Thickened plate of connective tissue containing glands

5

To which group of muscles do obicularis oculi belong?

Muscles of facial expression

6

What is the function of obicularis oculi?

Circular muscles surrounding the eye
Allow you to close your eyes

7

What is the innervation of obicularis oculi?

Facial Nerve (CN VII)

8

To which group of muscles does elevator palpebrae superioris belong?

Extraocular muscles

9

What is the function of elevator palpebrae superioris?

Elevator of upper eyelid

10

What is the innervation of elevator palpebrae superioris?

Oculomotor (CN III)

11

What is the tear pathway?

Lacrimal gland
Across cornea
Puncta lacrimalia
Canaliculi
Lacrimal sac
Nasolacrimal duct
Inferior meatus of lateral wall of nasal cavity

12

What is the innervation of the lacrimal gland?

Facial nerve (CN VII)
Parasympathetic

13

Which cranial nerves have a parasympathetic component?

Oculomotor (CN III)
Facial (CN VII)
Glossopharyngeal (CN IX)
Vagus (CN X)

14

What ar ether three main "functional" layers of the eyeball?

Outer fibrous
Middle vascular pigmented
Inner nervous

15

What are the components of the outer fibrous layer of the eyeball?

Sclera - white
Cornea - transparent

16

What are the components of the middle vascular pigmented layer of the eyeball?

Choroid
Ciliary body
Iris

17

What are the components of the inner nervous layer of the eyeball?

Retina

18

What are the components of the ciliary body?

Ciliary muscles
Suspensory ligament of lens

19

What is the effect of ciliary muscle relaxation?

Suspensory ligaments pull on lens
Lens thins
Long distance vision

20

What is the effect of ciliary muscle contraction?

Relaxation of suspensory ligaments
Lens fattens

21

What is the normal structure of the lens?

Round, bulbous structure

22

What are the two muscles contained within the iris?

Sphincter pupillae
Dilator pupillae

23

What is the function and innervation of sphincter pupillae?

Constrict pupil (bright light, accommodation)
Parasympathetic = Oculomotor (CN III)

24

What is the function and innervation of dilator pupillae?

Dilate pupil (dim light, fright)
Sympathetic control

25

What is the function and innervation of ciliary muscles?

Change the shape of the lens
Oculomotor (CN III)

26

What are the extrinsic muscles of the eye?

Superior rectus
Inferir rectus
Lateral rectus
Medial rectus
Inferior oblique
Superior oblique

27

What is the function of superior rectus?

Elevation
Moves eye up and in

28

What is the function of inferior rectus?

Depression
Moves eye down and in

29

What is the function of lateral rectus?

Abducts eye

30

What is the function of medial rectus?

Adducts eye

31

What is the function of superior oblique?

Moves eye down and out (tramp)

32

What is the function of inferior oblique?

Moves eye up and out

33

What is the innervation of the extrinsic eye muscles?

All = Oculomotor (CN III)
Lateral Rectus = Abducent (CN VI) "abducent supplies abductor)
Superior Oblique = Trochlear (CN IV) "passes through a trochlear"

34

How do you test medial rectus?

Make patient adduct eye

35

How do you test lateral rectus?

Make patient abduct eye

36

How do you test superior rectus?

Make patient abduct eye then look up

37

How do you test inferior rectus?

Make patient abduct eye then look down

38

How do you test superior oblique?

Make patient adduct eye then look down

39

How do you test inferior oblique?

Make patient adduct eye then look up