Orbit

Question 1

What are the branches of the Ophtalmic nerve?

Answer 1

1. nasocilliary
2. lacrimal
3. frontal

Question 2

To what bone does the falx cerebri attach to anteriolly?

Answer 2

the crista galli

Question 3

What nerve goes through the foramen rotundum?

Answer 3

V2, Maxillary

Question 4

What nerves go through the superior orbital fissure?

Answer 4

CN III, IV, VI, V1

Question 5

What goes through the optic canal?

Answer 5

the optic nerve and opthalmic artery

Question 6

What goes through the foramen ovale?

Answer 6

mandibular nerve (V3), lesser petrosal artery, accessory meningeal artery

Question 7

What is a blowout fracture?

Answer 7

fracture of the orbital floor caused by sudden intraorbital pressure

Question 8

What are signs of a blowout fracture?

Answer 8

crepitus (crackling sound)

diplopia (Double vision)

Question 9

What does the levator palpabrae superioris muscle do?

Answer 9

opens the upper eyelid

Question 10

What nerve innervates the levator palpabrae superioris muscle?

Answer 10

Superior division of Oculomotor nerve (III)

Question 11

What do Meibomian glands do?

Answer 11

secrete lipid substance from pores that prevents tears from evaporating

Question 12

What is oculomotor nerve palsy?

Answer 12

it is paralysis of oculomotor nerve causing ptosis of eyelid (drooping of eye)

Question 13

What is a Le Fort fracture 1?

Answer 13

Its a horizontal fracture of maxilla, crossing the bony nasal septum and the pterygoid plates of the sphenoid

Question 14

What are the branches off the frontal branch of opthalmic nerve?

Answer 14

1. Supratrochlear
2. Supraorbital

Question 15

What are the branches off the nasocilliary branch of ophtalmic nerve?

Answer 15

1. Posterior ethmoidal nerve
2. Anterior ethmoidal nerve
3. infratrochlear
4. long ciliary nerve

Question 16

What is a Le Fort fracture 2?

Answer 16

Thru maxillary sinus, infraorbital foramina, lacrimals or ethmoids to the bridge of nose – entire central part is separated

Question 17

What is a Le Fort Fracture 3?

Answer 17

Is a fracture thrugh superior orbital fissure, ethmoids, nasal bones, greater wings of sphenoid bone, and the frontozygomatic sutures

Question 18

Palsies that present with pain in the head or eye are usually caused by what?

Answer 18

compression of the nerve in the subarachnoid space by

1) an expanding aneurysm of the posterior communicating artery
2) vascular infarction or metastatic disease

Question 19

What muscle is affected with Cranial Nerve IV Palsy?

Answer 19

the Superior Oblique muscle

Question 20

Where can’t a patient with Cranial Nerve IV Palsy look?

Answer 20

patient unable to look down when adducted

Question 21

What does a patient with Cranial Nerve IV Palsy do to compensate for his defficiency?

Answer 21

patient will tilt head contra lateral to affected side

Question 22

Where can’t a patient with Cranial Nerve VI Palsy look?

Answer 22

The patient will be unable to look laterally beyond the midline.

Unable to Abduct the eye.

Question 23

What kind of innervation do the fibers that come off the lacrimal nerve have?

Answer 23

Parasympathetic innervation

Question 24

The frontal nerve gives off two branches, are these motor or sensory?

Answer 24

sensory

Question 25

The nasocilliary gives off 4 branches, are these branches motor or sensory?

Answer 25

sensory

Question 26

From where does the infratrochlear n. carry information from?

Answer 26

It carries information from the medial eyelid and lateral aspect of the nose

Question 27

The external branches of the anterior ethmoidal nerve convey sensation from where?

Answer 27

The apex of the nose and ala (nostril)