Video of Sperm (video) The Optical Society Loading video... Caption This video shows the track of a single sperm cell with a bent tail, in two dimensions (left) and three dimensions (right). Credit Credit: Biomedical Optics Express. Usage Restrictions Must include caption and credit. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.