Question

use the following diagram to answer questions 19 and 20. a preserved sheep eye dissect the eye in a circle, about halfway between the cornea and the optic nerve. panel b illustrates the anterior and posterior view of the dissected eye. the vitreous humour has been removed from the posterior portion to view better the internal structures. in the preserved eye, the retina is a tan colour as compared to the red colour in a living eye. the retina pinches at position (#3) of the eye where nerves from the retina exit the eye. behind the retina (which you could move with a dissecting probe) is a dark shiny layer (#4) with hues of purple that prevent light from bouncing around inside the eye. 19. the eye structures labelled 3 and 4, respectively, are a. fovea centralis and choroid layer b. blind spot and sclera c. blind spot and choroid layer d. fovea centralis and sclera hint: the retina is red in a living eye because a rich blood supply of capillaries is very near the surface. at times, this “red - eye” appears in photographs.

Explanation:

The blind - spot is the location where nerves from the retina exit the eye, causing a lack of photoreceptor cells. The choroid layer is the dark, shiny layer behind the retina that absorbs excess light. Based on the description in the text, structure 3 is where nerves exit the eye (blind - spot) and structure 4 is the dark, shiny layer behind the retina (choroid layer).

Answer:

C. blind spot and choroid layer