PSYA01H3 Lecture Notes - Ganglion Cell Layer, Aqueous Humour, Optic Disc

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Eyelid - cover from dust and dirt. Eyebrow - inhibiting sweat from exposing open eye. Upon obj. hitting face or surface of eye, they activate. Cause eyelid to close automatically, head withdrawl. Cornea: eye tissue; transparent, covers eye"s front side. Sclera: outer eye layer; tough, whiteness of eye. Iris: muscle; shows a pigment phenotype, controls pupil size. Double muscle band that controls amt of light allowed in. Adjustment thro. dilation/constriction depending on light conditions in environmt. Aqueous humour: fluid that fills region right behind cornea. Removes the fluid from blood & gets it to this eye region. Provides nutrients for cornea and other frontal parts of eye. Circulation and renewal key for using this fluid effectively (ex. cornea req. it for it to remain transparent) Eye disorder (vision dmged) by: rapid prod. of aqueous humour, clogging of passageway that returns aqueous humour to blood. => exposed to too much pressure by high [] of aq. humour w/in eye.

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