eye and ear functions

conjuctiva

• inner surface of eyelid

• lubricates the eye

lacrimal gland

• exocrine glands that produce tears

• lubricates eye

ciliary body

attach to lens

sclera

• white of eye

• part of outermost tunic (fibrous tunic)

cornea

• part of fibrous tunic

• central anterior clear layer of eye

optic disk

• lack photoreceptors

• blind spot

• where optic nerve comes out

fovea centralis

• center of retina

• sharpest vision spot

pupil

• controls amount of light that pass through

choroid

• known as vascular tunic

• blood rich for nutrition

retina

• known as sensory tunic

• has rods (gray tones) and cones (color)

iris

• color of eye

• regulate amount of light that enter eye

lens

• oval structure that focus light on retina

auricle

• known as pinna

• collect sound waves

external auditory canal

• produce earwax (cerumen)

• canal from pinna to eardrum

• transmits sound waves

tympanic membrane

• known as eardrum

• vibrate to convert sound to mechanical energy

malleus

• known as hammer

• club shaped ossicle that attaches to eardrum

incus

• known as anvil

• middle ossicle

stapes

• known as stirrup

• smallest ossicle that attaches to oval window

eustachian tube

• allows drainage of middle ear

oval window

• connects middle ear to cochlea

semicircular canals

• contains crista ampullaris

• help maintain dynamic equilibrium (balance)

vestibule

• contains maculae

• help maintain static equilibrium (balance)

cochlea

• contain organ of corti

• convert stimulus from environment into nerve impulse