A Chiari malformation (CM) is an abnormality in the lower part of the brain called the cerebellum. In normal anatomy, the cerebellar tonsils are located in the skull above the foramen magnum. Normally only the spinal cord passes through the foramen, however in Chiari the tonsils extend below the foramen.
Effects of Progesterone on the Uterine Lining. Progesterone plays an important part in the menstrual cycle. The menstrual cycle follows a precise pattern governed by the release of different hormones that interact with one another. Progesterone, whose production increases in the second half of the menstrual cycle, plays a pivotal part in preparing the uterine lining for implantation of an embryo. The corpus luteum, the remains of the ovulating follicle, produces progesterone after ovulation.
Dr. Jocelyn Craparo gives a complete overview of the functions of estrogen and progesterone. This is important background in understanding the changes that come with menopause and some of the therapies directed at their treatment. â Beverly Vaughn, MD, Medical Coordinator, Menopause and You Program.strogen and Progesterone. Estrogen is produced by the ovarian follicle (ovary), and estrogen levels rise through the early part of the menstrual cycle. Progesterone begins to be produced upon ovulation, and levels elevate through the remainder of the cycle until dropping just prior to the menstrual flow.