2: Anatomy - orbit and eye Flashcards Preview

Ophthalmology Week 1 2017/18 > 2: Anatomy - orbit and eye > Flashcards

Flashcards in 2: Anatomy - orbit and eye Deck (105)
Loading flashcards...
1

What is the bony orbit?

Hole in the skull which the eyeball (globe) sits in

2

Which cranial bones make up the bony orbit?

Frontal bone

Maxilla

Zygoma

Sphenoid bone

Ethmoid bone

Lacrimal (a new one)

3

What are two important features of the frontal bone related to the bony orbit?

Orbital plate - the part of the frontal bone on the inside of the orbit

Supraorbital notch - or foramen, if it's closed

4

What is an important feature of the maxilla in relation to the bony orbit?

Infraorbital foramen

5

Which important structures travel through the supraorbital and infraorbital notches?

Neurovascular bundles

6

What is an important feature of the sphenoid bone which transmits the optic nerve and blood vessels of the bony orbit?

Which feature of the sphenoid bone transmits other nerves and is found close to this structure?

Optic canal

Superior orbital fissure

7

What space is found inferior and lateral to the optic canal?

Which bone are it and the optic canal found in?

Superior orbital fissure

Sphenoid bone

8

The edges of the bony orbit are called ___.

margins

9

What are the superior, inferior, medial and lateral margins of the bony orbit collectively called?

Orbital rim

10

Where is the apex of the bony orbit found?

Optic canal

11

The apex of the bony orbit is slightly (medial / lateral).

medial

or nasal

12

The superior, inferior, medial and lateral margins are collectively known as the ___ ___.

orbital rim

13

How does the orbital rim protect the eye?

Anything larger in diameter than the orbital rim cannot make contact with the eye

So it protects the eye from direct trauma

14

Which is more anterior:

superior orbital margin

inferior orbital margin?

superior orbital margin

where your eyebrows sit

15

The orbital rim is fairly (thick / thin).

thin

16

What name is given to fractures of the medial and inferior orbital margins?

Orbital blowout fracture

17

What can be compromised by an orbital blowout fracture?

Inferior neurovascular bundle

e.g infraorbital nerve, a branch of CN V2 (maxillary division of trigeminal nerve)

causing a sensory deficit to maxillary skin

18

What would happen if CN V2 was damaged by an orbital blowout fracture?

Loss of sensation to maxillary region of skin

19

Which structure holds the eye in place and can be damaged by a zygoma fracture?

Suspensory ligament

Eye drops towards floor of orbit, causing diplopia (double vision)

20

Which circular muscle surrounds the eye and is responsible for closing the eyelids?

Orbicularis oculi

21

What is the function of the orbicularis oculi muscle?

Closes the eyelids

22

What are the two parts of the orbicularis oculi muscle?

Orbital (outer)

Palpebral (inner)

23

Which sheet of fascia connects the orbital rim to the eyelids?

Orbital septum

24

Which bits of fascia hold the shape of the upper and lower eyelids?

Superior tarsus and inferior tarsus

25

The tendon of which muscle attaches to the superior tarsus and helps to lift the superior eyelid?

Levator palpebrae superioris

26

Which muscles are responsible for

a) opening the superior eyelid

b) closing both eyelids?

a) Levator palpebrae superioris

b) Orbicularis oculi

27

Which ligaments hold the shape of the eye?

Medial palpebral ligament

Lateral palpebral ligament

28

Name the following structures:

a) Hold the shape of the superior and inferior eyelids (2)

b) Hold the general shape of the eye (2)

c) Extends as a sheet from the orbital rim to the eyelids (1)

d) Attaches to the superior eyelid and helps open it (1)

e) Closes both eyelids

a) Superior and inferior tarsus

b) Medial and lateral palpebral ligaments

c) Orbital septum

d) Tendon of levator palpebrae superioris

e) Orbicularis oculi

29

Name the important connective tissue structures of the eyelids.

Orbital septum

Superior and inferior tarsus

Tendon of levator palpebrae superioris

Medial and lateral palpebral ligaments

30

Which glands secrete lipids into the eye?

Tarsal glands