Which statement best describes horizontal cells in the inner nuclear layer?

Which statement best describes horizontal cells in the inner nuclear layer?

• A. They transmit signals from bipolar cells to ganglion cells
• B. They are a type of glial cell
• C. They interconnect with photoreceptors to adjust focus
• D. They are laterally interconnecting neurons that help integrate and regulate input from multiple photoreceptor cells.

Answer: (D)

Horizontal cells act as lateral interneurons in the retina. Their cell bodies reside in the inner nuclear layer, while their long processes extend horizontally to contact many photoreceptors. This arrangement lets them integrate input from multiple photoreceptors and provide inhibitory feedback to neighboring receptors, shaping the signals before they reach bipolar and ganglion cells. In other words, they create and regulate the center-surround interactions that help contrast and edge detection. That’s why they are best described as laterally interconnecting neurons that integrate and regulate input from multiple photoreceptor cells.

Horizontal cells act as lateral interneurons in the retina. Their cell bodies reside in the inner nuclear layer, while their long processes extend horizontally to contact many photoreceptors. This arrangement lets them integrate input from multiple photoreceptors and provide inhibitory feedback to neighboring receptors, shaping the signals before they reach bipolar and ganglion cells. In other words, they create and regulate the center-surround interactions that help contrast and edge detection. That’s why they are best described as laterally interconnecting neurons that integrate and regulate input from multiple photoreceptor cells.