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our dominant sense; 70% of all sensory receptors are in the eyes
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vision
our dominant sense; 70% of all sensory receptors are in the eyes
accessory structures
include eyebrows, eyelids, conjunctiva, lacrimal apparatus, and extrinsic eye muscle
eyebrows
shade the eye from sunlight; prevents sweat from entering eye
corrugator supercilli
scrunches eyebrows together
frontalis
raises eyebrows
eyelids
palpabrae; skin covered folds; contain tarsal plates (anchor orbicularis oculi and levator palpebrae superioris muscles)
blinking
prevents eye from drying
lacrimal caruncle
elevation at medial angle of eye; produces a whitish oily secretion that tends to collect during sleep (sandman sand)
tarsal gland
embedded in tarsal plate; produce an oily secretion that lubricates eye and prevents eyelids from sticking together
ciliary and sebaceous glands
lie between eyelash follicles
chalazion
inflamed tarsal gland
sty
enflamed ciliary or sebaceous gland
conjunctiva
mucous membrane that produces mucous; prevents eyes from drying
palpebral conjunctiva
lines eyelids
bulbar conjunctiva
covers anterior eye except for cornea
conjunctivitis
inflammation of either conjunctiva
lacrimal gland
located in orbit, superior and lateral to eyeball; continually produces lacrimal fluid (tears);
lysozyme
enzyme that kills bacteria
lacrimal fluid
tears; fluid contains lysozyme; fluid washes over the eye via blinking and is drained via lacrimal puncta (opening) at medial angle of eye-lacrimal sac-nasolacrimal duct-nasal cavity
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