The upper and lower portions of the lateral wall of the third ventricle correspond to the alar lamina and basal lamina, respectively, of the lateral wall of the fore-brain vesicle and are separated from each other by a furrow, the hypothalamic sulcus, which extends from the interventricular foramen to the cerebral aqueduct.
The upper and lower parts of the third ventricle's lateral wall correspond to the alar lamina and basal lamina in the forebrain vesicle. These sections are separated by a groove known as the hypothalamic sulcus, which extends from the interventricular foramen to the cerebral aqueduct.