Biology > QUESTIONS & ANSWERS > Mammalian+Eye+Dissection_PreLab+Q.docx (All)

Mammalian+Eye+Dissection_PreLab+Q.docx

Document Content and Description Below

Pre-laboratory Questions 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 c ... ornea” flows into the pigmented 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 3. Locate the blind spot for each of your eyes by drawing a small dot on the left side and a small "x" on the right side of an unlined, white index card. Hold the card about 20 cm (~8 in) from your face, close your right eye, and look at the "x" with your left eye. Move the paper slowly toward your face. When the dot is no longer visible, its image has fallen on the blind spot of the left eye. Repeat the process with the left eye closed and right eye open while looking at the dot. When the "x" disappears, its image is focused on the blind spot of the right eye. Were you able to find your blin [Show More]

Last updated: 3 years ago

Preview 1 out of 1 pages

Buy Now

Instant download

We Accept: