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
Pop Song (David Sylvian song) also original. They were later included on the remastered version of Sylvian's album Alchemy. Pop Song (David Sylvian song) "Pop Song" is a song by the English singer-songwriter David Sylvian. The song was a non-album single, recorded to promote the box set Weatherbox, but not actually featured on it (it did appear on a sampler). It made its compilation debut on Everything And Nothing. The song was written in response to Virgin asking Sylvian to write a 'Pop Song' to release as a single, which he responded to by writing a very unorthodox song called 'Pop Song'. The two B