Biology

BIO 125 Notes   Class One- January 22, 2008   Special Senses   Vision- Sense of Sight     70% of all sensory receptors are in the eye       Photoreceptor cells- convert light waves into electrical   impulses sent to brain       Basics       Protected by cushion of fat and bony orbit (7 bones)     Structure     Sclera- posterior, white dense fibrous tissue       {text:list-item}       Cornea- anterior, 2 epithelial layers       {text:list-item} {text:list-item}       Canal of Schlemn       Choroid       {text:list-item} {text:list-item} {text:list-item}       Ciliary Body (anterior)       {text:list-item} {text:list-item}       Iris- Colored part (variations f brown)       {text:list-item} {text:list-item}       Pupil- central black hole…       2 layers     Outer pigmented layer (nonvisual)       {text:list-item} {text:list-item} {text:list-item}       Inner Neural Layer (visual)       3 zones of neurons       {text:list-item} {text:list-item} {text:list-item}       Amacrine + horizontal cells       Ganglion Cell axons:       {text:list-item} {text:list-item}       Lens       {text:list-item} {text:list-item} {text:list-item} {text:list-item}   {text:list-item} {text:list-item}       Aqueous Humor       {text:list-item} {text:list-item} {text:list-item} {text:list-item}       Vitreous Humor       {text:list-item} {text:list-item} {text:list-item} {text:list-item}   {text:list-item}       Lacrimal Gland and associated ducts       Glands secrete tears       {text:list-item} {text:list-item} {text:list-item}       Extrinsic Eye Muscles       {text:list-item} {text:list-item} {text:list-item} {text:list-item}   {text:list-item}       Retinal Image Formation- 4 Processes       {text:list-item} {text:list-item} {text:list-item} {text:list-item}             Refraction of Light Rays         {text:list-item} {text:list-item} {text:list-item} {text:list-item}             Accommodation of the Lens         {text:list-item} {text:list-item} {text:list-item}       Close Vision...