Cow eye Dissection

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1. Describe the path traveled by a ray of light as it enters the eye and passes to the retina. When light is introduced to the eye it first enters into the “window-like cornea” flows into the p... igmented iris referred to as the pupil. Once this happens contractions and relaxation of the ciliary body changes the lens shape allowing for the focus to be altered. From the lens, this light will be projected onto the retina which is photosensitive and located in the posterior of the eye. This projected image conveys information to the enurons that form the optic nerve. The optic nerve then transfers this image being viewed to the brain to be processed and perceived “right side up”. 2. List the three tunics of the eye and their respective components. The outermost concentric layer is the fibrous tunic, followed by the middle vascular tunic and nervous tunic. The fibrous tunic is composed of the cornea (anterior) and sclera (posterior). Vasuclar tunic is composed of the iris, ciliary body, and choroid. The nervous tunic is composed of the retina and hold the photoreceptor cells [Show More]

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