| Namespace | MPheno.ontology | Obsolete | false |
| description | absence of the unpaired epithalamic structure that is shaped like a tiny pine cone and located above the posterior commissure near the level of the habenular complex and the sylvian aqueduct; the pineal is both a circumventricular organ and an endocrine organ that secretes melatonin, a serotonin-derived hormone involved in the regulation of circadian rhythms |
