| 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: | dorsal side | 
|---|---|
| Synonyms: | dorsal | 
| Definition: | An anatomical region that is the entire part of an anatomical structure dorsal to a horizontal plane and bounded on one side by the same transverse plane. | 
| Ontology: | Spatial Ontology [BSPO:0000063] |