midbrain true EFO:0000919 MA:0000207 UMLS:C0025462 NCIT:C12510 mesencephalic EMAPA:16974 XAO:0000014 uberon MESH:D008636 UBERON:0001891 BTO:0000138 MB FMA:61993 VHOG:0000069 MAT:0000106 mesencephalon HBA:9001 Middle part of the brain composed of the optic tectum and penducular region.[AAO] developmental relationships need revised TAO:0000128 OpenCyc:Mx4rvsBUqpwpEbGdrcN5Y29ycA AAO:0010149 DMBA:16649 part of brainstem in ABA - we reject this in favor of ISBN:0471888893 which has an implicit overlaps relationships The brain region between the forebrain anteriorly and the hindbrain posteriorly, including the tectum dorsally and the midbrain tegmentum ventrally. Kimmel et al, 1995.[TAO] MBA:313 RETIRED_EHDAA2:0001104 BM:MB ZFA:0000128 BIRNLEX:1667 CALOHA:TS-0630 EHDAA:3694 Fine structural, computerized three-dimensional (3D) mapping of cell connectivity in the amphioxus nervous system and comparative molecular genetic studies of amphioxus and tunicates have provided recent insights into the phylogenetic origin of the vertebrate nervous system. The results suggest that several of the genetic mechanisms for establishing and patterning the vertebrate nervous system already operated in the ancestral chordate and that the nerve cord of the proximate invertebrate ancestor of the vertebrates included a diencephalon, midbrain, hindbrain, and spinal cord.[well established][VHOG] BAMS:MES EHDAA2:0001162 EV:0100242 MIAA:0000106 http://braininfo.rprc.washington.edu/centraldirectory.aspx?ID=462 The midbrain is the middle division of the three primary divisions of the developing chordate brain or the corresponding part of the adult brain (in vertebrates, includes a ventral part containing the cerebral peduncles and a dorsal tectum containing the corpora quadrigemina and that surrounds the aqueduct of Sylvius connecting the third and fourth ventricles)[GO]. DHBA:10648 regional part of brain