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
Organ trade necessity. Organ trade Organ trade is the trade of human organs, tissues, or other body products, usually for transplantation. There is a global need or demand for healthy body parts for transplantation, far exceeding the numbers available. , about 114,000 people were reported to be waiting for a new organ in the United States. On average, an individual will wait three and a half years for an organ to become available for transplant. There is a worldwide shortage of organs available for transplantation, yet commercial trade in human organs is illegal in all countries except Iran. Despite these prohibitions, organ