Term: midbrain posterior-most region
Name: midbrain
Synonyms: mesencephalon
Definition: The brain region between the forebrain anteriorly and the hindbrain posteriorly, including the tectum dorsally and the midbrain tegmentum ventrally.
Ontology: Anatomy Ontology [ZFA:0000128]

Name: posterior-most region
Synonyms: posterior-most, posteriormost
Definition:
Ontology: Spatial Ontology [BSPO:0000037]