In the lateral geniculate body, layers 1, 4 and 6 receive retinal afferent fibres from one eye and layers 2, 3 and 5 from the other. Which eye supplies layers 2, 3 and 5?
- A Contralateral eye
- B Both eyes equally in every layer
- C Ipsilateral eye ✓
- D Only the temporal hemiretina of either eye
Correct answer: C. Ipsilateral eye
Explanation
The six-layer lateral geniculate nucleus follows the mnemonic that layers 1, 4 and 6 receive crossed fibres from the contralateral nasal hemiretina, while layers 2, 3 and 5 receive uncrossed fibres from the ipsilateral eye. Layers 1 and 2 are magnocellular and layers 3 to 6 parvocellular. Each layer contains a complete retinotopic map, and all layers project through the optic radiation to the primary visual cortex.
Reference: Gray's Anatomy, 42nd ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.