There are multiple definitions:

1. inner granular layer(English)

   • is a cytoarchitectural term denoting the innermost layer of the cerebral cortex in which granule cells predominate
   • OGL
   • Brain (dys)function
   • http://braininf…ry.aspx?ID=2449

2. intergeniculate leaflet(English)

   • SCN
   • Circadian rhythm, Pharmacology / pharmaceutics, Brain (dys)function, Anatomy
   • https://doi.org…/sj.bjp.0702176