procerebrum

noun3

1. •
   A structure found at the front of the cerebral ganglion (brain) of some mollusks, such as pulmonate gastropods and cephalopods, which is associated with processing sensory information and coordinating motor functions.

   • The terrestrial slug Limax has a highly developed olfactory center, the procerebrum, in which the LFP spontaneously oscillates,” scientists in Shido, Japan report. — 2012
2. •
   The forepart of an insect brain that is involved in processing sensory information, particularly related to vision and olfaction.

   • The median mass of the procerebrum is formed by the fusion of the procerebral lobes. — 1963
3. •
   (old-fashioned) The prosencephalon.