lateral sulcus true uberon fissure of Sylvius BM:Tel-Cx-LS NCIT:C32615 HBA:9402 UBERON:0002721 BAMS:lf BIRNLEX:1487 fissura lateralis cerebri (sylvii) sulcus lateralis A sulcus that divides the frontal lobe and parietal lobe above from the temporal lobe below. It is in both hemispheres of the brain but is longer in the left hemisphere. The lateral sulcus is one of the earliest-developing sulci of the human brain. It first appears around the fourteenth gestational week[WP,modified]. fissura transversa cerebri fissura lateralis cerebri transverse cerebral fissure DHBA:10621 FMA:77801 lateral fissure http://braininfo.rprc.washington.edu/centraldirectory.aspx?ID=49 Sylvian fissure lateral fissure of Sylvius Sylvian sulcus fissura lateralis UMLS:C0228187 LS lateral cerebral fissure sulcus cerebri lateralis (Sylvii) sulcus lateralis cerebri lateral cerebral sulcus DHBA:12110 BAMS:ls subarachnoid sulcus