The macula lutea of the retina provides high-acuity color vision because of which histological feature?

• A High concentration of rods with multiple convergence to a single ganglion cell
• B Thick ganglion cell layer with large bipolar cells
• C High concentration of cones with 1:1 ratio to ganglion cells (foveal cone pedicles) ✓
• D High density of retinal pigment epithelium cells

Explanation

The fovea centralis within the macula contains exclusively cones (no rods) in its center. In the foveal pit, there is a 1:1:1 ratio of cones to bipolar cells to ganglion cells — each cone has a private line to the brain, maximizing spatial resolution. The overlying inner retinal layers (bipolar and ganglion cells) are displaced laterally (foveal depression) to minimize light scatter. This density of cones and private pathways accounts for the high visual acuity; elsewhere in the retina, many rods converge onto single ganglion cells (spatial summation at the cost of resolution).

Reference: BD Chaurasia's Human Anatomy, 8th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.