Visual pathway and LGB

  • Lateral geniculate body is relay station on visual pathway.
  • Receives fibres from ipsilateral temporal hemiretina and contralateral nasal hemiretina.
  • Grey matter of LGB is split into 6 lamina.
  • Fibres from ipsilateral temporal hemiretina ends in- 2,3,5.
  • Fibres from contralateral nasal hemiretina ends in-1,4,6.
  • Magnocellular and parvocellular pathways project to occipital cortex(area 17)

Magnocellular pathway

Detects depth and movement flicker.

Originates from layers 1 and 2

Parvocellular pathway

Carries information regarding color,texture ,shape and fine details of objects.

Originates from layers 3,4,5,6.

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