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Unformatted text preview: 2-15-08 anatomy notes1.Organ Systems2.Nervous Systema.Special Sensesi.Vision (sight)1.Structure of the Eyea.3 layers of tissues or coats1.Choroid-middle layera.Posteriori.Darkly pigmentedii.Highly vascular-provides nutrition for retinab.Anterior-darkly pigmented and vasculari.Ciliary Muscle (part of ciliary muscle)-smooth & involuntary attaches post. choroids to ant. sclera which pulls choroid forwardii.Ciliary Processes (part of ciliary muscle)-has extensions that connect to very fine fibers (aka zonular fibers)connect to lens of the eye; SUM TOTAL of fibers=suspensory ligament of the eyeiii.Iris (color; part of ciliary muscle)-in center has an opening that is pupil; function-regulate amount of light that enters the eye; muscles are smooth and involuntary; sphincter pupillae-right around edge of pupil (when they contract, the eye contracts); dilator pupillae-from edge of pupil to outer edge of iris (contraction makes it bigger)2.Retina (inner layer & is photosensitive)-has 6 layersa.Photoreceptor Neurons-right next to retinai.Rods-100 millionii.ii....
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