procerebrum
/ˌprəʊsɪˈriːbr(ə)m/ /prəʊˈsɛrɪbr(ə)m/Chiefly Zoology
noun
The anterior part of the central nervous system in various invertebrates; specifically the lateral lobe of the cerebral ganglion of certain molluscs; the protocerebrum of an arthropod.
Origin
Late 19th century; earliest use found in American Naturalist. From pro- + cerebrum.