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External Anatomy of the Eye
The eye is protected by the ________________________ and cushioned by ___________.
Bony orbit consists of:
ethmoid, sphenoid, lacrimal, frontal, zygomatic, and maxillary bones
Accessory structures include:
Eye muscles
Eyelids
Moisture makers
Lacrimal apparatus
Eye Muscles
There are _____ skeletal ________________ that control eye movement.
They are ________________ to the ______________________________ of each eye.
The muscles are named according to their position.
Name of Muscle
Eye Movement
Lateral rectus . . .
eye moves ___________________
Medial rectus . . .
eye moves ___________________
Superior rectus . . .
eye rolls _____________
Inferior rectus . . .
eye rolls _____________
Inferior oblique . . .
eye rolls up and lateral
Superior oblique . . .
eye rolls down and lateral
Eyelids
The eye is protected by ___________________, AKA: palpebrae.
The eyelids meet at the medial and lateral canthus or _____________ of the eye.
The medial canthus is different from the lateral one in that is houses a reddish tissue called the
caruncle. Eye residue collects in this location.
The ______________________ or border of each eyelid is referred to as the tarsal plate.
Projecting from each eyelid are eyelashes which ________________________________ from
_______________ into the ________.
Eyebrows serve the same purpose.
Moisture Makers
Three different products keep the surface of the eye _____________________ and moist.
1.
_________________
2.
_________________
3.
_________________
* Cranial nerve V (the ____________________ nerve) allows us to detect when particles have
landed on the surface of the eye and these lubricants prevent them from adhering.
The eye has modified __________________________, known as ciliary glands. They lie
________________ the individual __________________.
A thin membrane called the conjunctiva lines the __________________
of the ______________ _____________________ and covers part of the
surface of the eyeball. The conjunctive secretes a thin ___________ that
lubricates the eyeball.
Modified __________________ glands called meibomian glands are found under each lid.
These glands produce an oily substance that lubricates the eye.
Lacrimal Apparatus
The lacrimal glands are located at the ____________________________ edge of each eye
underneath the eyelids. They release _____________ through several small ducts.
Tears flush across the eyeball and collect in the medial canthus. There, they ____________
through _______________________called puncta, into the lacrimal canals and then the liquid
moves down the nasolacrimal duct which empties into the ___________________
__________________.