Floor of third ventricle is formed by all except
The floor is formed from before backwards by:Optic chiasmTuber cinereumInfundibulumMamillary bodiesPosterior perforated substanceTegmentum of midbrain(Ref: Vishram Singh textbook of clinical neuroanatomy second edition pg 137)
Tuber cinereum
Posterior perforated substance
Tegmentum
Anterior pituitary
Brain 