Longitudinal fissure Longitudinal fissure The longitudinal fissure (or cerebral fissure, median longitudinal fissure, or interhemispheric fissure) is the deep groove that separates the two hemispheres of the vertebrate brain. The medial surfaces of the two hemispheres are as similarly convoluted by gyri and sulci as is the outer surface of the brain. It is thought that a majority of existing animals, including Homo sapiens, have evolved from a common wormlike ancestor that lived around 600 million years ago, called the urbilaterian. A bilaterian animal is one that has symmetrical left and right body halves. While it is still debated whether this species
Sylvian Joululaulu älskade Nord! Och när du går bort under himmelens bryn, välsigna min fädernejord! I blommande vårar på gyllene strand, var finnes ett land som mitt fädernesland? För dig vill jag sjunga om kärlek och vår, så länge din Sylvias hjärta slår.</poem> An English version on luminarium.org Sylvian Joululaulu Sylvian Joululaulu (Swedish: "Sylvias hälsning från Sicilien"), "Sylvia's Christmas Song", is a poem by Zachris Topelius from 1853, which was composed to a christmas carol by Karl Collan. The poem has been translated to Finnish by both Elina Vaara and Martti Korpilahti, and the latter one from 1918 is one of the