The percentage of projection neurons and interneurons in the human lateral geniculate nucleus.

Projection neurons and local circuit neurons of the human lateral geniculate nucleus (LGN) offer different patterns of lipofuscin pigmentation. One type of projection cell (type I neuron) and two varieties of local circuit neurons (type II and type III neurons) can be distinguished on account of their characteristic pigmentation. The majority of the nerve cells are type I projection neurons. Pigmented type II neurons comprise about 8.5% and type III neurons devoid of pigment amount to only 0.2% of the nerve cells.