Color "blobs"

LGN (magnocellular)

LGN (parvocellular)


"Y" ganglion


"X" ganglion

Fast, Black and White Very Accurate, Color

Figure 51-4

Six layers of the primary visual cortex. The connections shown on the left side of the figure originate in the magnocellular layers of the lateral geniculate nucleus (LGN) and transmit rapidly changing black-and-white visual signals. The pathways to the right originate in the parvocellular layers (layers III through VI) of the LGN; they transmit signals that depict accurate spatial detail as well as color. Note especially the areas of the visual cortex called "color blobs," which are necessary for detection of color.

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Essentials of Human Physiology

Essentials of Human Physiology

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