Which layer of the retina contains the first synapse of the visual pathway?

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Prepare for the NBEO Ocular Anatomy Posterior Segment and Cranial Nerves Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Which layer of the retina contains the first synapse of the visual pathway?

Explanation:
The first synapse in the visual pathway occurs in the outer plexiform layer. Here, photoreceptors (rods and cones) connect to bipolar cells, with horizontal cells nearby providing lateral modulation. This is where the light signal begins its neural relay, from photoreceptors to bipolar cells. The next synapse happens later, in the inner plexiform layer, between bipolar cells and ganglion cells (with amacrine cells involved). The outer nuclear layer houses photoreceptor cell bodies, not synapses, and the ganglion cell layer contains the cell bodies of ganglion cells whose axons form the optic nerve.

The first synapse in the visual pathway occurs in the outer plexiform layer. Here, photoreceptors (rods and cones) connect to bipolar cells, with horizontal cells nearby providing lateral modulation. This is where the light signal begins its neural relay, from photoreceptors to bipolar cells. The next synapse happens later, in the inner plexiform layer, between bipolar cells and ganglion cells (with amacrine cells involved). The outer nuclear layer houses photoreceptor cell bodies, not synapses, and the ganglion cell layer contains the cell bodies of ganglion cells whose axons form the optic nerve.

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