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
Mermaids: The Body Found of "Animal Planet's" largest audiences ever. "Mermaids: The Body Found" received 1.9 million views during its US telecast premiere on Sunday, May 27, 2012. This is the network's most watched telecast since the Steve Irwin memorial special in September 2006. "Mermaids" Animal Planet has been criticized for giving the impression of being an actual documentary, when in fact much of the material was made up, and the scientists shown were actors. Publicity for the program included a website falsely claiming government seizure of the site's domain, and the US National Oceanic and Atmospheric Administration put up a rebuttal to the