SPINAL CORD, EYE, AND EAR FUNCTIONS

Pia mater

membrane that surrounds spinal cord

dura mater

protects spinal cord

subarachnoid space CSF

nourishes body

Dorsal root gnaglion

signals spinal cord and sensory neuron

White matter

Schwann cells

Gray matter

Myelinated cells

central tool

motor output

dorsal funiculus

motor

dorsal funiculus

fine touch

ventral funiculus

pain/temp

auricle

captures external sound

external acoustic meatus

carries sound to tympanic membrane

tympanic membrane

vibrates- physical sound energy

pharyngotympanic tube

equalizes pressure

oval window

transmits vibrations in ear

round window

releases energy

helicotrema

redirects energy

basilar membrane

houses hair cells

tectorial membrane

bends hair cells to stimulate hearing

inner hair cell

strongly stimulated

cochlear nerve

sends hearing info to brain

Superior oblique muscle

depresses eye, turns laterally

superior rectus muscle

elevates eye, turns medially

lateral rectus muscle

moves eye laterally

inferior oblique muscle

elevates eye, turns laterally

inferior rectus muscle

depresses eye, turns medially

ciliary muscle

adjusts lens

ciliary process

makes fluid for eye

ciliary zonule

holds lens together

cornea

bends eye

pupil

allows light in

lens

focus image

scleral venous sinus

regulates eye pressure

sclera

protects eye shape

choroid

blood supply

retina

photo receptor cells

macula lutea

central vision

fovea centralis

detailed vision

optic nerve

transmits visual signals to the brain.

central artery

vein of the retina that supplies blood to the retina.

optic disc

the point where the optic nerve exits the eye, also known as the blind spot.

Retina

receives flipped image