BGYB30H3 Lecture 14 Notes Autonomic and Somatic Control-Oct 27

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University of Toronto Scarborough
Biological Sciences
Ingrid L.Stefanovic

BGYB30H3 Lecture 14 Notes -cornea is the area of the eye where light enters, and the pupil can change amount of light entering -lens focuses light onto the retina, which contains photoreceptor cells -fovea has the highest visual acuity -optic disk (blindspot) is found at the back of the retina and contains no photoreceptors -zonules and cilary control the shape of the lens -aqueous humour supports the lens while the vitreous humour controls the shape of the eye ball -neural pathways from the eye go to the optic chiasm where it may crossover and synapse in the lateral geniculate nucleus of the thalamus -collaterals from thalamus to the midbrain synapse onto cranial nerve III to control pupil diameter -lens flip image to focus on the retina and changes shape through accommodation -light rays refract in the fluid of the eye to produce an inverted image on the retina -distance from centre of the lens to the focal point on the retina is the focal length -presbyopia is the loss of the ability of the lens to change shape and occurs with aging -when light is not bent, cilary muscles are relaxed and zonules contract -when light is bent, cillary muscles contract and zonules relax -distant objects of 20 meters or more causes the lens to be flat because light rays are parallel -when object is closer than 20 meters
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