insula

noun
in·su·la | \ˈin(t)s-(y)ə-lə, ˈin-shə-lə \
plural insulae\-ˌlē, -ˌlī \

Medical Definition of insula 

: the lobe in the center of the cerebral hemisphere that is situated deeply between the lips of the sylvian fissure

called also central lobe, island of Reil

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