22 Questions
What wall of the orbit is thin?
Medial wall
Which sinus is not directly related to the orbit?
Sphenoid sinus
What supports the eyeball in the orbit?
Suspensory ligament
What stimulates the production of lacrimal fluid?
Parasympathetic impulses from CN VII
What happens to the lacrimal fluid when the eyelids blink?
It is pushed medially over the cornea
What is the function of the orbicularis oculi muscle?
Closes the eyelids during sleep and blinking
What is the result of a lesion in CN III?
Ptosis (drooping eyelid)
What is the function of the superior tarsal muscle?
Raises the eyelid
What happens to the focal point of the lens when its curvature increases?
It shifts closer to the eye
How many extra-ocular muscles are responsible for moving the eyeball?
6
Which nerve is responsible for innervating the superior oblique muscle?
CN IV
What is the name of the artery that supplies the orbit?
Ophthalmic artery
What is the name of the ganglion that is responsible for autonomic innervation of the eye?
Ciliary ganglion
Which branch of the ophthalmic nerve is responsible for innervating the lacrimal gland?
Lacrimal branch
What is the name of the sinus that is involved in the venous drainage of the orbit?
Cavernous sinus
What is the name of the fissure that contains the ophthalmic nerve and the ophthalmic artery?
Superior orbital fissure
What prevents the eyelids from closing fully in the event of damage to the facial nerve (CN VII)?
Paralysis
Which layer of the eyeball is continuous with the ciliary body and iris?
Choroid
What secretes the aqueous humour?
Ciliary process
Which muscle arrangement and innervation are responsible for dilating the pupil?
Radially arranged, sympathetic innervation
What happens to the lens when the ciliary muscles contract to focus on near objects?
Tension in zonal fibers decreases
What is the primary reason for the 'red eye' effect in flash photos?
Reflection from the choroid
This quiz covers the structure and components of the eye and orbit, including the walls, surrounding sinuses, and supporting ligaments.
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