optic recess optic recess 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). optic recessthe hypophysis cerebri, in position. shown in sagittal section. (optic recess labeled at upper right.)median sagittal section of brain. the relations of the pia mater are indicated by the red color. (optic recess labeled at lower left.)detailsidentifierslatinrecessus supraopticusneuronames457neurolex idnlx_144280ta98a14.1.08.418ta25773fma78455anatomical terms of neuroanatomy additional images drawing of a cast of the ventricular cavities, viewed from the side.