Final answer:
The three layers of the eye, from external to internal, are the fibrous tunic, vascular tunic, and neural tunic. The fibrous tunic includes the sclera and cornea, the vascular tunic consists of the choroid, ciliary body, and iris, and the neural tunic contains the retina with its photoreceptor cells.
Step-by-step explanation:
The eye is composed of three layers of tissue:
- Fibrous tunic: This is the outermost layer that includes the sclera and the cornea. The sclera is the white part of the eye, and the cornea is a transparent layer that allows light to enter the eye.
- Vascular tunic: Also known as the uvea, this middle layer is primarily composed of the choroid, ciliary body, and iris. The choroid provides blood supply to the eye, while the ciliary body and iris help control the amount of light entering the eye through the lens and pupil.
- Neural tunic: This is the innermost layer called the retina. It contains the photoreceptor cells known as rods and cones, which are responsible for capturing light and transmitting visual information to the brain.