occipital sulcus superior calcarine sulcus true uberon The term superior calcarine sulcus refers to one of two extensions of the calcarine sulcus where it splits into two short vertically oriented branches near the occipital pole. This is the dorsally curved superior branch; the other is a symmetrical, ventrally curved inferior calcarine sulcus. UBERON:0025096 BIRNLEX:4014 sulcus calcarinus superior superior calcarine sulcus superior ramus of calcarine fissure upper calcarine sulcus https://www.ncbi.nlm.nih.gov/pubmed/26063964