09 -- Visual system part 3 - Into the Brain Overview of...

Info icon This preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Into the Brain: Overview of Main Visual Pathway Primary visual pathway Retinal ganglion cell axons exit eyeball via optic nerve Lateral geniculate nucleus (LGN) of the thalamus Optic radiation nerve fibers Primary visual cortex (V1; striate cortex) Higher visual cortical regions (V2, V3, etc.)
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
Visual Pathway Circuitry Note the part of each eyeball receiving input from left/right visual field Note crossing of select axon groups at optic chiasm Thalamus Retina Retina Retina Optic Nerve Optic Tract
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Temporal Retina Temporal Retina Nasal Retina Visual Pathway Circuitry     LGN Input LGN Input VISUAL FIELD VISUAL FIELD Each LGN getting info  exclusively from one  side of the visual field Notice   input from  each eye remains  separate
Image of page 4
Lateral Geniculate Nucleus (LGN) LGN is a  6-layered 6-layered  structure Input to layers organized by: Eye (left vs right) Type of ganglion cell (M vs P vs nonM-nonP) Receptive fields similar to ganglion cells ON-center OFF-surround OFF-center On-surround In-between layers (pink pink area) receive signals that travel by the nonM-nonP pathway (brown) (brown) (green) Called  koniocellular koniocellular  layer Parallel streams still intact!
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Visual Cortical Areas Optic  Radiation
Image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern