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Destinations of Optic Nerve Signals

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Let's finish our discussion of cranial nerve number two,

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the optic nerve with a couple of pearls.

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The contralateral nasal retinal projection,

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from the lateral, projecting onto the medial

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aspect of the retina.

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So lateral projecting on medial retina,

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is going to come down,

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and is going to cross over the other side.

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Same thing here,

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projects onto the medial retina,

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comes down and crosses in the optic

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chiasm to the contralateral side.

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In contrast,

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the medial field is going to project onto the

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lateral retina and it's going to

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stay ipsilateral like. So.

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Now, we also said that there are a number of

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which we'll show you in a minute.

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There is a knee or turn of the optic radiation.

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There is an occipital or occipital.

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Temporal and a temporal component of this turn,

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where it will then project onto the Cuneus or

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optic cortex. It'll happen on both sides.

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Now I'm going to scroll up a little bit

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to the level of the calcarine sulcus.

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And at this level, we've got the calcarine cortex.

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And I wanted to high light the synapse

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positions a little bit higher,

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which include the lateral geniculate nucleus,

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which is going to sit right about here on both

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sides. That's going to receive a synapse.

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The superior colliculus,

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that's going to receive a synapse.

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And now we have one final third synapse to add to

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our layering of anatomy for the visual pathway.

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And that is the pulvinar right there.

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So that concludes our discussion of the visual

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pathway. So if we put it all together,

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we've got the globes, we've got the retina,

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we've got the optic Nerve.

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We got the intracanalicular for raminal optic

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nerve. We have the prechiasmatic nerve.

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The optic chiasm a little infundibular recess

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in the middle with a pituitary stalk,

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the optic tracts moving posteriorly,

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a synapse on the superior colliculus and

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the lateral geniculate nucleus,

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a synapse on the pulvinar and

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then continuation back,

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including something known as Meyer's loop that will

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arborize onto the visual cortex in the region of

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the calcarine sulcus which we see right here.

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That concludes our discussion of the visual pathway.

Report

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Faculty

Stephen J Pomeranz, MD

Chief Medical Officer, ProScan Imaging. Founder, MRI Online

ProScan Imaging

Tags

Orbit

Neuroradiology

MRI

Head and Neck

Brain

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