General Sense Organs
often exist as individual cells or receptor units and widely distributed throughout the body; pain and touch
Special Sense Organs
large and complex and localized grouping of specialized receptors; eye, nose, ear, smell and taste buds
Pupil, Cornea and Lens
3 most important parts of the eye
first layer of eyeball; tough outer coat; "white of eye"
the transparent part of the sclera over iris; "window of eye"
hole in iris is the...
second layer of eyeball; pigmented vascular layer prevents scattering of light
Ciliary Muscle and Iris Muscle
front part of the choroid is made up of two muscles, what are they?
mucous membrane covering the front surface of the sclera and lining the eyelid
inflammation of the conjunctiva and can interfere with refraction; infection also known as pink eye
attached to lens with ligament causing lens to change shapes
colored circular structure with spoked and circular fibers causing pupil to dilate or constrict; brown, blue colored part of eye
maintain normal shape of eye and help refract light rays
in the anterior cavity in front of the lens (watery)
constantly being formed, drained and replaced, if blocked pressure will increase causing glaucoma
has three kinds of cones sensitive to red, green or blue; allows us to distinguish colors
defective curvature of cornea or lens of the eye; distortion caused by an irregularity of cornea or lens
is often caused by a shortened eyeball; farsightedness
is often caused by elongation of the eyeball; nearsightedness
able to see far not near
able to see near not far
excessive intraocular pressure that decreases blood flow in retina causing retinal degeneration; due to abnormal accumulation of aqueos humor in eye
night blindness or the inability to see in dim light is caused by retinal degeneration or lack of Vitamin A