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lam·i·na ter·mi·na·lis of cer·e·brum[TA]
a thin plate that passes upward from the optic chiasm to form the rostral boundary of the third ventricle; membrane representing the position of the closed rostral neuropore.
The frontmost (rostral) wall of the neural tube. In the developed brain, the lamina terminalis remains as the thin rostral wall of the third ventricle, stretching from the bases of the major cerebral commissures (the anterior commissure, the commissure of the fornix, and the rostrum of the corpus callosum) to the dorsal surface of the optic chiasm.
See also: lamina