Lectures 2-5 Cowen

Question 1

What four parts make up the orbital wall? (Address is 2234. 2 walls have 2 bones, 1 wall with 3, 1 with 4 bones)

What are the foramen and fissures? (3)

What’s the most important frontal bone?

Are the fissures and foramen the weakest part of the orbit?

What’s the weakest part of the orbit? What could happen if this part gets depressed?

Answer 1

Orbital roof, lateral wall, orbital floor, medial wall

Anterior orbit, mid orbit, orbital apex

Superior orbital fissure

YES, disease can enter here as well as trauma

Floor of the orbit. The inferior rectus could get trapped below the orbital floor

Question 2

What are the structures inside and outside the Annulus of Zinn?

(Luscious French Tatas Standing Naked In Anticipation)

Answer 2

Inside: (Standing Naked In Anticipation)
Nasocilliary, abducens, superior and inferior oculomotor

Outside: (Luscious French T***)
Lacrimal, facial trochlear

Question 3

1. What do these extraocular muscles do?
   - Levator palpebrae
   - Superior/inferior oblique
2. Thyroid eye disease usually starts with what muscle?
3. What are common signs of thyroid disease regarding the eye?

Answer 3

1. EOMs:
   - Elevates eyelid
   - Torsion
2. IR, inferior rectus
3. Dry eyes, upper lid retraction

Question 4

What do these ligaments do?

1. Medial canthal ligament
2. Lateral canthal ligament
3. Orbital septum

Answer 4

1 and 2 both help open and close the eyes, keep eyes stable. When stressed, causes eyelids to collapse on cornea.

3. Helps with opening and closing the eyes, can have problems with inflammation.

Question 5

A patient with shingles can have an infection of __(CN?), which can affect the _______ nerve. Can cause the eye to get shingles as well

What two nerves can cause numbness of forehead?

Answer 5

V1
nasociliary

Supraorbital, supratrochlear

Question 6

What are the 3 systems of lacrimal anatomy?

What’s the most important part of the secretory system?

Answer 6

Secretory system, distributary system, excretory system.

Lacrimal gland

Question 7

Vasculature

Each vessel originates where?

Veins originate?

Vein most common for infection/ophthalmic problems?

Retrograde movement of infection to cavernous sinus can be caused by what?

Answer 7

Apex of orbit

Cavernous sinus

Superior ophthalmic vein

Squeezing a cist could cause this to shoot backwards

Question 8

What’s the address of the orbit?

Medial-2
Lateral-4
Roof-2
Floor-3

Answer 8

Ethmoid, lacrimal lobes

Sphenoid, lacrimal, ethmoid, maxillary

Frontal bone, sphenoid

Maxilla, zygomatic, palatine

Question 9

Distributors system

What happens with Bells Palsy?

What do protractor muscles do?

Excretory system:

Why is the puncta important?

What’s the weakest part of the eyelid?

Answer 9

Problem with CN:VII that doesn’t allow protractor muscles to work

Cause the eye to close

Needs to be positioned perfectly so the tears can come into it from the lacrimal gland

Inferior canaliculus