Which LGN layers are magnocellular?

Which LGN layers are magnocellular?

• A. 5-6
• B. 3-4
• C. 1-2
• D. 2-3

Answer: (C)

Magnocellular layers are the two LGN layers that contain large neurons and receive input from M-type retinal ganglion cells. These cells are specialized for motion and temporal changes, with large receptive fields and fast responses, sending rapid information to the cortex. In primates, these magnocellular layers are the first two layers of the LGN, labeled 1 and 2. The remaining layers (3–6) are parvocellular, which handle color and high-spatial-resolution detail, with smaller receptive fields. There are also koniocellular layers intercalated between them, but the classic magnocellular layers are the first two. That’s why the correct choice is the first two layers.

Magnocellular layers are the two LGN layers that contain large neurons and receive input from M-type retinal ganglion cells. These cells are specialized for motion and temporal changes, with large receptive fields and fast responses, sending rapid information to the cortex. In primates, these magnocellular layers are the first two layers of the LGN, labeled 1 and 2. The remaining layers (3–6) are parvocellular, which handle color and high-spatial-resolution detail, with smaller receptive fields. There are also koniocellular layers intercalated between them, but the classic magnocellular layers are the first two. That’s why the correct choice is the first two layers.