Advertisement Upgrade to remove ads


Eyeball and all components it holds

3 main layers of eyeball wall

Sclera, choroid and retina


Eyelids, eyebrows. tear drainage system, orbital walls and orbit contents (accessory structures)

Role of eyelids

protect fron injury, excessive light and to spread tear film over cornea

Orbicularis Oculi

Closes eyelids; used in blinking, winking, and squinting
sphincter muscle

Levator palpebrea superioris

elevate upper eyelid out of line of vision

Muller Muscle

smooth muscle, involuntary muscle of eyelid

Tarsal Plate

a thick fold of connective tissue that gives form and support to the eyelids

grey line

refers to areas along meibomian gland openings, surgical reference point


corners where eyelids come together. lateral & medial.
Lateral is acute angle and medial is rounded


found in the medial canthus, it is a small fleshy mass containing sebacceous glands


drainage hole in corner of eyeball for tears; connects upper/lower eyelids to drainage canal; visible at inner canthus of upper/lower lids


a vertical fold of skin on either side of the nose

palpebral fissure

The almond shaped opening between the upper and lower eyelids

lacrimal glands

gland located in the upper outer region above the eyeball that secretes tears

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again


Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording