Neuro-Ophthalmology Vol. 1 Flashcards
Where is the sella turcica located?
Posteromedial to the orbits within the body of sphenoid bone
What structure separates the greater and lesser wings of the sphenoid?
Superior orbital fissure
Where are the cavernous sinuses located?
On each side of the sella turcica
What structure passes through the cribriform plate?
CN I
What structure passes through the foramen ovale?
Mandibular division (V3) of trigeminal nerve
What structure passes through the foramen rotundum?
Maxillary division (V2) of trigeminal nerve
What structure marks the inferior border of the anterior cranial fossa?
Frontal ethmoidal suture
What nerve is the supraorbital nerve a terminal branch of?
Frontal nerve
What structure separates the orbit from the middle cranial fossa?
Greater wing of sphenoid
What structure forms the medial wall of the optic canal?
Sphenoid sinus
What structure is at risk of damage during surgery involving the sphenoid sinus?
Optic nerve
What is the average height of the orbit?
35 mm
What is the average width of the orbit?
45 mm
What is the average total volume of the orbit?
30 cc
What is the average depth of the orbit?
40 mm
What 4 bones make up the orbital rim?
- Frontal 2. Zygomatic 3. Maxillary 4.Lacrimal
What structure makes up the largest portion of the medial wall?
Lamina papyracae of the ethmoid bone
What structure separates the optic canal from the superior orbital fissure?
Optic strut
What structure lies posterior to the superior orbital fissure?
Cavernous sinus
What blood vessels do the anterior posterior ethmoidal foramen connect?
Internal carotid circulation and external carotid circulation
Where does the right common carotid artery originate?
Innominate artery
Where do the vertebral arteries enter the skull?
Foramen magnum
What vessels merge to form the basilar artery?
Vertebral arteries
Where does the basilar artery terminate?
At the posterior cerebral arteries at the level of the midbrain
Where is the basilar artery located?
Along the anterior surface of the pons
Where does the common carotid artery bifurcate into the internal and external carotid artery?
At the C2 level near the angle of the jaw
What artery supplies the paranasal sinuses?
Maxillary artery
What artery supplies the middle meningeal artery?
External carotid artery via the maxillary artery
Through what structure does the middle meningeal artery enter the skull?
Foramen spinosum (lateral to foramen ovale)
What complication may occur in the treatment of AVM by neuroradiological manipulation of instruments into the external carotid artery?
Embolization of the distal branches of the ICA and central retinal artery (due to collaterals)
