Eye Dissection Analysis

To begin with the surface of they eye, the eye is covered in fatty tissue to protect the eye, and there are muscles outside of the eye that let the eye move up and down, left and right in the sheep eye since they have 4 muscles but the extra 2 in humans lets us roll our eyes. The outside of the eye is called the sclera and it is very thick so give structure and protection to the eye.

To begin the light pathway, we have the cornea that bends the eyes based on the wavelength of light and in the dissection, it was cloudy because there were no nutrients going into it. Next, the light goes through the aqueous humor which is behind the cornea that gives the cornea the shape and helps the eye stay stiff when in use. after the humor comes the pupil that is controlled by the iris, the colored portion of the eye; the pupil is dark black and will control the amount of light brought in. When the surrounding is dark, the pupil will widen so that as much light as possible can be let in and for the surroundings, with lots of light the pupil is small to limit the amount of light let in. Next, comes the lens. The lens is circular and hard, but smooth (rubbery), and is right behind the pupil. around the lens and pupil are the ciliary bodies contract or relax so that the lens to see things far away or close up. Next, comes the vitreous humor, which is a jelly-like substance behind the lens; the humor keeps the shape of the eye. The retina is a thin layer in behind and resting on the vitreous humor and it is attached to the choroid. The place where the retina attaches to is also called the blind spot. Inside the retina includes the cones and rods which give the color and the shade of the light and then the light goes through the optic nerve which sends chemo-receptors to the brain. In the sheep eye, but not in human eyes, is the tapetum lucidum which reflects light so that nocturnal animals are able to take in, even more, light to the eye so that seeing in the dark becomes easier.

And that is the SHEEP EYE!