So generally speaking, the menstrual cycle can be broken down into three phases. We have the follicular phase, we have ovulation and we have the luteal phase. Now the follicular phase is categorized by the development of the immature XL into the mature Xcel. So we go from a primary OSI to a secondary OSI. Now, once that follicle has matured, the follicle ruptures in a process known as ovulation. The second phase and ovulation releases that secondary OCIL into the peritoneal cavity and then into the fallopian tube.