Hearing/vision/retina stuff

what is hearing

translation of sound waves in the form of vibrations

low frequency

vibrates near apex

medium frequency

vibrates near middle

high frequency

vibrates near base

what is vision

in charge of translating light waves as they are reflected off something into perception of an image

what is conjunctivitis?

inflammation of the conjunctiva (pink eye)

How do we move the eye?

oblique (twist)

How do we keep our eyes lubricated?

tears produced from the lacrimal duct sweep over the eye each blink

excessive tear production can lead to

leakage onto face, or out of the nose

why do we get conjected when we cry?

nasolacrimal duct connects to the nose

what is the retina

inner lining of the back of the eye

what are the two main parts of the retina?

cones and rods

Cones

color vision

Rods

shades of gray (light)

rods and cones synapse with bipolar neurons, which in turn synapse with retinal ganglion cells to create which cranial nerev?

optic nerve

Parasympathetic- sphincter pupillae

muscle contracts (narrower)

Sympathetic- dilator pupillae

muscle dilates (wider)

Accommodation

the adjustment to shape and lens