luke

3 Tunics of the Eye
1. Fibrous – outer protection and support. (cornea and sclera  white shit of eye)
a) cornea
• makes up the anterior 1/3 of the eye
• for light refraction or light bending and its non elastic
• only organ transplanted from one individual to another without rejection
• lots of collagen fibers

b) sclera
• makes up the posterior 2/3 of the eye/tunic
• it is non-elastic also
• anchors extrinsic eye muscles LR6[SO4]3
• the optic nerve, CN II , pierces the sclera which causes a blind spot known as the optic disc
• maintains shape of eyeball because of the vitreous humor. The cornea and lens are part of refraction, but the lens is not a tunic. The lens is elastic and can change. The cornea is non elastic. The cornea is the most important when dealing with refraction.
• anterior part of eye deals with H2O secretion
posterior part of ...