30 Questions
Which cranial nerves supply the extraocular muscles?
Cranial nerves 3, 4, and 6
What is the main nerve supply to the eye?
Cranial nerve 2
Which bone forms the roof of the orbit?
Frontal bone
What is the shape of the orbit?
Pyramidal
Which of the following can cause reduced perfusion to the eyeball and the optic nerve resulting in potential loss of vision?
Intraorbital pressure increases
Which muscle is responsible for lifting the upper eyelid?
Levator palpebrae superioris
What is the consequence of total compression of the right optic nerve by an intraorbital tumor on the right side?
Monocular blindness in the right eye
What is the function of the oblique muscles in the eye?
To move the eye in a circular motion
Which nerve provides somatic sensory innervation to the eye, lacrimal gland, orbit, and the skin around the orbit and forehead?
Ophthalmic nerve (V1)
Which nerve runs just under the roof of the orbit and has two terminal branches, the supraorbital nerve and the supratrochlear nerve?
Frontal nerve
Which nerve carries pain and touch sensation from the cornea via its long posterior ciliary branches and supplies the structures of the eye itself, ethmoid sinus, and the skin over the nose?
Nasociliary nerve
Which nerve carries somatic sensory information from the lacrimal gland, lateral conjunctiva, and a small area of skin over the lateral portion of the eyelids?
Lacrimal nerve
Which cranial nerve is responsible for innervating the medial rectus muscle?
Oculomotor nerve (CN 3)
What is the clinical presentation of oculomotor nerve palsy?
Drooped eyelid and dilated pupil
Why is abducens nerve palsy considered an ominous sign?
It is the first cranial nerve affected in raised intra-cranial pressure
What is the function of the conchae in the nasal cavity?
To warm and humidify inspired air
Which of the following sinuses is located within the frontal bone?
Frontal sinus
Which nerve(s) innervate the frontal sinus?
V1 - Ophthalmic, frontal branch
Which sinuses are innervated by both the V1 - Ophthalmic and V2 - Maxillary branches of the trigeminal nerve?
Sphenoid and maxillary sinuses
Which artery is involved in anterior nosebleeds?
External carotid artery
Which cranial nerves are involved in allowing and opposing superior movement of the eye?
CN III and CN IV
What structures of the orbit and nasal cavity can be identified on the CT scan?
Zygoma and conchae
Which plane was the CT scan taken in?
Coronal
Which muscle is responsible for the inability to move the right eye superiorly when adducted?
Superior rectus
Are there any evidence of bone fractures in the CT scan?
No, there are no bone fractures
What was the main complaint of the patient when they came to the emergency department?
Double vision
What nerve supplies the superior oblique muscle?
Trochlear nerve
What is the main artery supplying the orbit?
Ophthalmic artery
What is the result of a blockage of the central retinal artery?
Sudden loss of sight in affected eye
If a patient is asked to look up and to the right, which muscles of the left eye would you be testing?
Superior and inferior recti muscles
Test your knowledge on the paranasal sinuses and their anatomy. Identify the different sinuses and learn about their drainage pathways and innervation.
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