The front portion of the HYPOTHALAMUS separated into the preoptic region and the supraoptic region. The preoptic region is made up of the periventricular GRAY MATTER of the rostral portion of the THIRD VENTRICLE and contains the preoptic ventricular nucleus and the medial preoptic nucleus. The supraoptic region contains the PARAVENTRICULAR HYPOTHALAMIC NUCLEUS, the SUPRAOPTIC NUCLEUS, the ANTERIOR HYPOTHALAMIC NUCLEUS, and the SUPRACHIASMATIC NUCLEUS.

Synonyms: Hypothalamic Commissure, Anterior, Hypothalamus, Anterior, Anteroventral Periventricular Nucleus, Nucleus, Anteroventral Periventricular, Anterior Hypothalamic Commissure, Anterior Hypothalamic Commissures, Supraoptic Hypothalamus, Commissures, Anterior Hypothalamic, Hypothalamic Commissures, Anterior, Hypothalamus, Supraoptic, Anterior Hypothalamic Decussation of Ganser, Anterior Hypothalamus, Commissure, Anterior Hypothalamic, Periventricular Nucleus, Anteroventral