Lateral geniculate nucleus
Structure

In humans the LGN is normally described as having six distinctive layers. The inner two layers, (1 and 2) are magnocellular layers, while the outer four layers, (3, 4, 5 and 6), are parvocellular layers. An additional set of neurons, known as the koniocellular layers, are found ventral to each of the magnocellular and parvocellular layers.: 227ff This layering is variable between primate species, and extra leafleting is variable within species.
punctuation:no_comma