The female reproductive system is freakin' cool. That's all I'm saying. What is the corpus luteum, and how does it work? What is a corpus luteum cyst? What is corpus luteum deficiency? All the answers here.
If a conceptus implants, the corpus luteum grows even bigger, to form the so-called corpus luteum of pregnancy. If no pregnancy occurs, the corpus luteum shrinks dramatically to become a corpus albicans (visible as white scars)