3 Coats or Tunics:
1. Outter most fiberous layer (whites of eyes) serves as the point of attachment for ectrinsic muscles of the eye.
2. middle vasular layer
3. inner most later od specialized photoreceptors( rods and cones)
Sclera
Choroid
Retina
Filled with aqueous humor compriesd of anterior and posterior chambers in front of and behind the lend glaucoma canal of schlemm drains aqueuous humor
anterior cavity
filled with vitreous humor
vitreous cavity
transparent outer portion sclera covers entier outer wall of eyeball except at cornea
cornea
colored portion of eyeball regulates size of pupil
iris
anterior prtion of vascular tunic ciliary miscles change the shape of the lenfs while the ciliary processes secrete aquesous humor
ciliary body
site where opitc nerve leave eyeball blind spot no rods or cones
optic disc
120million/eye allow vision in dim light more numerous in periphery of retina
Rods
6-7 million/eye produce color stimiulated by bright light mroe numerous in center of eye
cones
small depression in center of the retina contains only cones area of highest visual acutiy
central fovea
bending of light rays occurs at the surface of the cornea and at the surface of the lens
refraction
consists of pinna external auditory meatus and tympanic membrane
external ear
consists of the auditory ossicles (malleus-hammer, incus-anvil, staples-stirrup) oval window, round window, tnedor tympani stapedius