Everything Eyes PDF

 StartFocus · When Ciliary Muscles contract They release tension on the zopular fibers which causes the lens to be...

 StartFocus · When Ciliary Muscles contract They release tension on the zopular fibers which causes the lens to be more spherical. The fibers release tensionOn the lens , making it larger This allows your eye to focus close. · When Ciliary Muscles Relax they full on the zonular fibers which Creates ↓ more tension on the lens. It flattens... This allows your eye to see far. · Iris muscles come in Pairs Circular with Radial When these eye Muscles Contract Constriction Limits amount of light coming in Dialation Changing Size of Pupils Lets more Light come in  The place where light is sensed Light hits the Rods and Cones , Changing their membrane Potential of the neurons ,Causing them to fire action Potentials. Middle layer neurons Synapse With theafferents to the Central nervous These are called system ganglion cells. · light hits ganglion Cells first , they send Projections to the train. Sensory neurons Pigment Cells · We don't have reflective cells , instead we sleep at light when it's dark, If Reflective they bounce Rods comes , light back to requiring less Sensory Stimulus to activate Rods + Comes  Horizontal and Amacrine Cells allow for Modulation Complexity Retinas have ability Process single to areas Of light "Pixels" · Light makes it through a bunch of layers, but won't do anything till it reaches the Rods and Cones · At low light , Comes are not activated , but rods a re , rods Sense Contrast · Lones intensity are configured to a particular wavelength of light color , but the Rods = Contrast of the output depends on saturation of color or brightness of light. On Center Off Center · Rods = light Sensitivity and Perifery · Cones = Acuity and Focus cells Process · Ganglion the information from the Rods and Cones  Light filling Light filling entire entire On Center Retina Means baseline results in greatest Output, EPD S. Membrane Potential Hyper Polarization = More negative Baseline · In the dark , cGMP is produced which keeps Not Channels Open which depolarizes the membrace but only to a Certain Point because at the Some the Cath is leaving Time 2 Time Times On Center Still on , So doesn't go back to baseline Glutamate Same as Surround Cone  Chapter 12 : Central Visual Pathways Dorsal View Primative Instincts Mobilizing Movements Visual Reflexes Orienting Vision toStimuli occipital Lobe Of Action Potential Optic Nerve Optic Chiasm Optic Tract Lateral geniculate · Nerve-bundle of axons in Periphery Nucleus Central · Tract = Gundle of axons in nervous system Overlap · · bo Processing  T ·Los An · Periphery · · = Right side of each eye · Central Vision = Left Side of each eye Surface of Cerebrum  Association · Panage to the right side of the Parietal lobe People lose , the ability to Percive and Pay attention to the left side of things You. Can still see the left side just , not internalize it. · The Right Inferior Temporal Lobe responds to real faces. · Right Inferior Temporal Cortex has areas that Light up in response to certain faces.  Forea is a fixed Point Reforation Repositioning of the forea Occulomotor Abducens , and Trocklear Control eye Muscle movements. Superior Rectos Contracts Eye moves up and Inferior rectus relaxes Interior rectus contracts Eye moves down and Superior rectus relaxes Right Lateral Rectrs Contracts Right medial rectus relaxes , Left Medial rectus Contracts and left lateral rectus relaxes Superior Oblique 6 contraction , the is pulled back by relaxing the eye is pushed forwards , movement of our eyeballs Adds 3 Dimentionality  · Right abducens goes to Right Lateral rectus Left A , goes to Left R · Left Trochlear goes to Right Superior Colliculos · Left Occulomotor goes toLeft S.R FR MR ando , , 6 Afferent us Efferent Ipsclateral us Contralateral