At the junction of the floor and anterior wall of the third ventricle, immediately above the optic chiasma, the ventricle presents a small angular recess or diverticulum, the optic recess (or supraoptic recess).

Additional images

File:Gray736.png, Drawing of a cast of the ventricular cavities, viewed from the side.

References

Ventricular system {{Neuroanatomy-stub