Definition of diencephalon in English:

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Pronunciation: /ˌdʌɪɛnˈsɛf(ə)lɒn/
Pronunciation: /ˌdʌɪɛnˈkɛf(ə)lɒn/


The caudal (posterior) part of the forebrain, containing the epithalamus, thalamus, hypothalamus, and ventral thalamus and the third ventricle. Compare with telencephalon.
Example sentences
  • The latter includes the diencephalon; mesencephalon, or midbrain; pons; and medulla oblongata.
  • The neurohypophysis, or posterior pituitary, is derived from an evagination of the infundibular portion of the diencephalon of the brain.
  • From previous anatomical data, we hypothesize that the level of such actions is suprametameric, with strong implication of the diencephalon and cerebral cortex.



Pronunciation: /ˌdʌɪɛnsɛˈfɑlɪk/
Example sentences
  • The red nucleus has been cleaned so that its larger, spherical mesencephalic part can be distinguished from the more rostral, ovoid diencephalic part.
  • Transversal cut at the level of the anterior preoptic area showing ACTH-immunoreactivity cell groups around the diencephalic ventricle.
  • He showed that electro-acupuncture stimulation can affect the diencephalic area of the brain, a region that promotes the body's own healing responses.


Late 19th century: from di-3 'across' + Greek enkephalos 'brain'.

For editors and proofreaders

Line breaks: di|enceph|alon

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