Sketch of the Microfluidic Chip (IMAGE) Biophysical Society Caption The spermatozoon is free to swim to the restricted contact area on the bottom of the oocyte membrane. Credit Benjamin Ravaux Usage Restrictions This image may be used only with appropriate caption and credit. License Licensed content 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.