At the junction of the floor and anterior wall of the third ventricle, immediately above the optic chiasma, the ventricle presents a small angular<unk>  or diverticulum, the<unk>  (or supraoptic<unk> .
Optic recess
Lacrimal groove
Optic pit
Orbital septum
Optic cup 
Syrinx 
Lacrimal sac
Optic stalk