PHS 3341 Chapter 3: CNS 3 Reading
7 Dec 2016
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Document Summary
The eyeball is sheltered by the bony socket in which it sits. The eyelids protect the anterior portion of the eyeball. Close reflexively to cover the eye from threats. Tears are produced from the lacrimal gland and lubricate, cleanse and act as an anti-bacterial. The drainage system cannot handle the amount of tears during crying, so tears overflow. Eyelashes trap fine, airborne debris such as dust. Each eye is a spherical, fluid-filled structure enclosed by three layers. Specialized anteriorly to form the ciliary body and iris. Photoreceptors that convert light energy into nerve impulses. The interior of the eye consists of two fluid-filled cavities separated by a lens. Important for maintaining the spherical shape of the eye. Carriers nutrients for the cornea and lens, both of which lack a. Carriers nutrients for the cornea and lens, both of which lack a blood supply. Produced by a capillary network within the ciliary body.
