In the six-layered lateral geniculate body, fibres from the contralateral nasal retina terminate in which layers?
- A Layers 1, 4 and 6
- B Layers 2, 3 and 5 ✓
- C Layers 1 and 2 only
- D Layers 3, 4, 5 and 6
Correct answer: B. Layers 2, 3 and 5
Explanation
The classic mnemonic is that crossed nasal retinal fibres end in layers 2, 3 and 5, while uncrossed temporal retinal fibres end in layers 1, 4 and 6. Layers 1 and 2 are the magnocellular layers receiving large fast-conducting Y-type axons concerned with motion, and layers 3 to 6 are parvocellular, handling colour and fine form. Distractor A reverses the convention, so students who half remember the pattern fall for it.
Reference: Gray's Anatomy: The Anatomical Basis of Clinical Practice, 42nd ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.