In an era of low birth rates and rising marriage ages, interest in male fertility, as well as female fertility, is growing. According to experts, sperm motility is a crucial factor in male fertility.

Exposing immobile sperm to ultrasound waves gets them moving, a lab study has shown. Sperm that don’t move properly are a key cause of infertility, as it is harder for them to reach the egg. With ...

Panel A shows the microscopic myoarchitecture of the circular and longitudinal muscle layers of the lower esophageal sphincter and stomach. The circular muscle fibers of the esophagus cross each other ...