From the case:
Occipital horn (illustration)
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The occipital horn is the posterior-most extension of the lateral ventricle, projecting into the occipital lobe. Its walls are formed by white matter tracts that cause indentations.
The roof and lateral wall of the occipital horn are formed by the tapetum (fibers from the splenium of the corpus callosum).
The floor is elevated by white matter over the collateral sulcus, forming the collateral eminence.
The medial wall has two elevations. Superiorly the bulb of the posterior horn, formed by fibers from forceps major. Inferiorly the calcar avis, formed by white matter over the calcarine sulcus (primary visual cortex).
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