Noun betweenbrain has 1 sense
  1. diencephalon, interbrain, betweenbrain, thalmencephalon - the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon
    --1 is a kind of neural structure
    --1 is a part of forebrain, prosencephalon
    --1 has parts:
     mamillary body, mammillary body, corpus mamillare; infundibulum; third eye, pineal eye; optic nerve, nervus opticus, second cranial nerve, optic tract; pituitary, pituitary gland, pituitary body, hypophysis; basal ganglion; thalamus; hypothalamus
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