eye Flashcards
external landmarks (sclera, cornea, iris, pupil)
eyelids (palpebrae)
whites of the eye
- posterior 5/6 of eye
- function: provides shape to eyeball and protects inner parts
sclera
transparent; in front of iris (center part)
- curved transparent structure anterior to iris and pupil
- anterior 1/6 of the eye
- function: admits and refracts (bends) light
cornea
pigmented part of the eye
- contains pupil
- function: regulates the amount of light entering the eye (by dilating and constricting
iris
opening in iris
pupil
lining sclera and eyelid
function: secrete mucus as lubricant for eye/eyelids
conjunctiva
inflammation of conjunctiva (“pink eye”)
conjunctivitis
produces/collects tears
lacrimal apparatus
tears
lacrimal fluid
produces and secretes tears
lacrimal gland
t/f: fluid is swept across the surface of the eye by the eyelids
true
from lacrimal puncta (hole) to nasolacrimal duct
lacrimal canaliculi
drains tears into nasal cavity, where they are eventually swallowed
nasolacrimal duct
why do tears spill onto the cheek when someone gets a runny nose?
- tears overwhelm the system (lacrimal apparatus)
- too many tears to collect - overflow the eyelids
- nasolacrimal duct pours lots of tears into nasal cavity - runny nose
moves eye medially (adducts)
- eye moves toward nose
medial rectus
moves eye laterally (abducts)
- eye moves toward ear
lateral rectus
elevates eye and moves eye medially
superior rectus
depresses eye and moves eye medially
inferior rectus