part of part of develops_from midbrain midbrain tegmentum 'tegmentum' is used generically for the ventral part of the brainstem (ISBN10:0471888893). We use the label 'midbrain tegmentum' to denote the midbrain structure. In NIFSTD tegmentum is a composite structure and there is a separate class for midbrain tegmentum and pontine tegmentum BAMS:MTg BTO:0003388 DHBA:12195 EFO:0000921 EHDAA2:0004475 EMAPA:18215 FMA:62393 HBA:9002 MA:0000212 MAT:0000452 MTg TAO:0000160 Together, our results reveal a shared basic organization in the tegmental domains of the diencephalon and midbrain of developing lamprey, indicating early appearance of the domain in vertebrate phylogeny.[well established][VHOG] UBERON:0001943 UMLS:C0039441 VHOG:0001367 Ventral part of the midbrain, separated from the hindbrain by the isthmus[ISBN10:0471888893]. Subdivision of the midbrain lying anterior to the tectum and posterior to the substantia nigra and cerebral peduncle[FMA] The part of the midbrain extending from the substantia nigra to the cerebral aqueduct in a horizontal section of the midbrain. It forms the floor of the midbrain that surrounds the cerebral aqueduct[WP]. XAO:0004271 ZFA:0000160 http://braininfo.rprc.washington.edu/centraldirectory.aspx?ID=491 mesencephalic tegmentum tegmentum tegmentum mesencephali tegmentum mesencephalicum tegmentum of midbrain uberon brainstem regional part of brain midbrain basal plate