Symptoms depend on which muscles are affected. For example, when weakness affects muscles of the chest, people may have difficulty breathing. When weakness affects muscles that control the eyes, people may have double vision. Complete muscle weakness causes paralysis.
The choroid is the layer of blood vessels and connective tissue between the sclera (white of the eye) and retina. It is part of the uvea and supplies nutrients to the inner parts of the eye.
Only cones are found in the fovea centralis, whereas mostly rods are found in the periphery of the retina. Cones are the photoreceptors that operate best in bright light and allow for color vision. Dissection of the Cow (Sheep) Eye. 14. What modification of the choroid that is not present in humans is found in the cow eye? Tapetum lucidum What is its function? To reflect light that enters the eye, thus increasing light stimulation of the retina under dim light conditions 15. What does the retina look like?