NCIt definition : A relatively large region on the lateral surface of the frontal lobe and part of the
prefrontal cortex, which lies between the superior and the inferior frontal sulci
and rostral to the precentral gyrus.;
Alternative definition : CDISC: A ridge on the lateral surface of the frontal lobe, which lies between the
superior and inferior frontal sulci, and rostral to the precentral gyrus.;