Sense Organs (EYE & EAR) Functions

Ribaya BIO125

extrinsic eye muscles

movement of head

lacrimal gland

produces tear

sclera

protects eye, attachment site for extrinsic eye muscles, gives shape to the eye

cornea

protects eye, transmits and bends light

iris

changes diameter of pupil

pupil

regulates amount of light enters the eye

lens

focuses light onto retina

ciliary body

changes shape of lens

suspensory ligaments

holds lens in place

vitreous humor

transmits light and gives shape to the eye

retina

contains photoreceptors (rods and cones) and bends light

optic disc

blind spot

macula lutea/fovea centralis

central vision (generates sharp color images)

choroid coat

provides blood to the eye wall, prevents light from scattering

optic nerve

sends visual information from eye to brain

auricle

directs sound waves into the external auditory canal

external auditory canal

transmits sound waves from the auricle to the tympanic membrane

tympanic membrane

converts sounds waves into vibrations

ossicles: malleus, incus, stapes

transmits vibrations from the tympanic membrane to the oval window

oval window

carries sound vibrations from middle ear to the inner year

cochlea

contains receptors for hearing

vestibulocochlear nerve

sends information from the ear to brain

auditory tube

equalizes ear pressure

vestibule

senses static equilibrium

semicircular canals

senses rotational acceleration of the head