third ventricle true consider adding class for secondary vesicle precursor UBERON:0002286 uberon DHBA:10602 NCIT:C12827 ventriculus diencephali Fluid-filled brain cavity. Kimmel et al, 1995.[TAO] MA:0000182 ventriculus tertius cerebri relationship loss: develops_from forebrain ventricle (TAO:0001259)[TAO] Part of the ventricular system of the brain, forming a single large cavity in the midline of the diencephalon; it is continuous with the lateral ventricles through the interventricular foramen and the fourth ventricle through the cerebral aqueduct. (Maryann Martone) https://www.ncbi.nlm.nih.gov/pubmed/22091816 FMA:78454 CALOHA:TS-2058 BAMS:V3 EHDAA2:0000084 3rd ventricle MESH:D020542 BAMS:3V BM:Die-3V GAID:614 EV:0100308 OpenCyc:Mx4rvakhcJwpEbGdrcN5Y29ycA diencephalic ventricle diencephalic vesicle MBA:129 HBA:9420 ZFA:0000161 EMAPA:16900 The early development of most vertebrate brains is similar (...). The zebrafish neural tube follows the same basic differentiation pattern as the mammalian neural tube (reference 1); The brain develops from three embryonic enlargements of the neural tube, which later differentiate into five regions. A forebrain differentiates into telencephalon and diencephalon. The midbrain, or mesencephalon, remains undivided. The hindbrain divides into the metencephalon and myelencephalon. Cavities within the brain enlarge to form a series of interconnected ventricles (reference 2).[well established][VHOG] BIRNLEX:714 TAO:0000161 UMLS:C0149555 VHOG:0000007 brain ventricle