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Anatomy and Physiology - Objective 1
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
Closes eyelids; used in blinking, winking, and squinting
Levator palpebrea superioris
elevate upper eyelid out of line of vision
smooth muscle, involuntary muscle of eyelid
a thick fold of connective tissue that gives form and support to the eyelids
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
The almond shaped opening between the upper and lower eyelids
gland located in the upper outer region above the eyeball that secretes tears