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precrucial
precrucial adj.
Brit. 
/(ˌ)priːˈkruːʃl/
, /(ˌ)priːˈkruːʃl/U.S. /ˌpriˈkruʃəl/
Zoology (now rare) (in carnivores and certain other mammals) situated in front of the cruciate sulcus of the cerebrum./ˌpriˈkruʃəl/ΚΠ
1885 Athenæum 3 Jan. 20/3 A distinct and conspicuous lozenge-shaped patch of brain substance defined by the crucial and precrucial sulci.
1974 Brain Res. 73 229 A discrete phonatory area in the isthmus of the prefrontal (precrucial) gyrus.
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