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pl. habenulae [L. habenula, little rein, strap]
1. A frenum or any reinlike or whiplike structure.
2. A peduncle or stalk attached to the pineal body of the brain. Fibers that travel posteriorly along the dorsomedial border of the thalamus to the habenular ganglia (epithalamus) resemble reins.
3. A narrow bandlike stricture.
habenular (hă-ben′yŭ-lăr ), adj.