09 -- Visual system part 3

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

Info iconThis 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.)
Background image of page 1

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

View Full DocumentRight Arrow Icon
Background 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
Background image of page 3

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

View Full DocumentRight 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
Background 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) (green) Called  koniocellular koniocellular  layer Parallel streams still intact!
Background image of page 5

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

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

This note was uploaded on 03/23/2009 for the course BIOL 450 taught by Professor Jeremyingraham during the Spring '09 term at UNC.

Page1 / 19

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

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online