The deepest and most prominent of the
cortical fissures, extending from the
anterior perforated stuff
first laterally at the
deep incisure between the
frontal and
temporal lobes, then
back and slightly upward over the
lateral aspect of the
cerebral hemisphere, with the superior
temporal gyrus as its lower bank, the
insula forming its greatly expanded floor. Two
short side divisions, the
ramus anterior and
ramus ascendens,
divide the
inferior frontal gyrus into an
orbital part,
triangular part, and
opercular part.
Synonym: sulcus
lateralis cerebri,
fissura cerebri lateralis,
lateral cerebral fissure, sylvian fissure,
fissure of Sylvius.